Only Plasma black screens on AMD GPU (GCN#2)

TW 20260113 and prior for weeks:

# zypper lr -p
# | Alias     | Enabled | GPG Check | Priority | URI
--+-----------+---------+-----------+----------+----------------------------------------------------------------------------
1 | FCLunst   | Yes     | ( p) Yes  |   99     | http://silk.apana.org.au/rpm-unstable-dev
2 | Non-OSS   | Yes     | (r ) Yes  |   99     | http://download.opensuse.org/tumbleweed/repo/non-oss
3 | OSS       | Yes     | (r ) Yes  |   99     | http://download.opensuse.org/tumbleweed/repo/oss
4 | TDE       | Yes     | (  ) No   |   90     | http://archive.trinitydesktop.net/trinity/rpm/osstw/trinity-r14/RPMS/x86_64
5 | TDEnoarch | Yes     | (  ) No   |   90     | http://archive.trinitydesktop.net/trinity/rpm/osstw/trinity-r14/RPMS/noarch
6 | Update    | Yes     | (r ) Yes  |   99     | http://download.opensuse.org/update/tumbleweed/

IceWM and TDE sessions work as expected, e.g.:

# inxi -GSaz --zl --hostname
System:
  Host: ga88x Kernel: 6.18.5-1-default arch: x86_64 bits: 64 compiler: gcc
    v: 15.2.1 clocksource: tsc avail: hpet,acpi_pm
    parameters: BOOT_IMAGE=/boot/vmlinuz root=LABEL=<filter> noresume
    ipv6.disable=1 net.ifnames=0 mitigations=off consoleblank=0
  Desktop: TDE (Trinity) v: R14.1.5 tk: Qt v: 3.5.0 wm: Twin v: 3.0
    with: kicker vt: 7 dm: SDDM Distro: openSUSE Tumbleweed 20260113
Graphics:
  Device-1: Advanced Micro Devices [AMD/ATI] Kaveri [Radeon R7 Graphics]
    vendor: Gigabyte driver: radeon v: kernel alternate: amdgpu arch: GCN-2
    code: Sea Islands process: GF/TSMC 16-28nm built: 2013-17 ports:
    active: DVI-D-1,HDMI-A-1 empty: VGA-1 bus-ID: 00:01.0 chip-ID: 1002:130f
    class-ID: 0300
  Display: x11 server: X.Org v: 21.1.21 with: Xwayland v: 24.1.8
    compositor: Twin v: 3.0 driver: X: loaded: modesetting unloaded: vesa
    alternate: fbdev dri: radeonsi gpu: radeon display-ID: :0 screens: 1
  Screen-1: 0 s-res: 4240x1440 s-dpi: 120 s-size: 897x304mm (35.31x11.97")
    s-diag: 947mm (37.29")
  Monitor-1: DVI-D-1 pos: right model: Dell P2213 serial: <filter>
    built: 2013 res: mode: 1680x1050 hz: 60 scale: 100% (1) dpi: 90 gamma: 1.2
    size: 473x296mm (18.62x11.65") diag: 558mm (22") ratio: 16:10 modes:
    max: 1680x1050 min: 720x400
  Monitor-2: HDMI-A-1 mapped: HDMI-1 pos: primary,left model: Acer K272HUL
    serial: <filter> built: 2018 res: mode: 2560x1440 hz: 60 scale: 100% (1)
    dpi: 109 gamma: 1.2 size: 598x336mm (23.54x13.23") diag: 686mm (27")
    ratio: 16:9 modes: max: 2560x1440 min: 720x400
  API: EGL v: 1.5 hw: drv: amd radeonsi platforms: device: 0 drv: radeonsi
    device: 1 drv: swrast gbm: drv: radeonsi surfaceless: drv: radeonsi x11:
    drv: radeonsi inactive: wayland
  API: OpenGL v: 4.5 vendor: amd mesa v: 25.3.3 glx-v: 1.4
    direct-render: yes renderer: KAVERI (radeonsi ACO DRM 2.51 6.18.5-1-default)
    device-ID: 1002:130f memory: 1000 MiB unified: no
  API: Vulkan v: 1.4.335 layers: 1 device: 0 type: cpu name: llvmpipe (LLVM
    21.1.7 256 bits) driver: mesa llvmpipe v: 25.3.3 (LLVM 21.1.7)
    device-ID: 10005:0000 surfaces: N/A
  Info: Tools: api: clinfo, eglinfo, glxinfo, vulkaninfo
    de: kscreen-console,kscreen-doctor wl: wayland-info,wlr-randr
    x11: xdpyinfo, xprop, xrandr
#
  1. Wayland instead of X11 simply exits back to SDDM.
  2. Same problem with 20251217, last worked with 20251016.
  3. Same problem regardless of kernel 6.12.58, 6.17.9, 6.12.65, 6.18.5.
  4. Same problem whether kernel module radeon or amdgpu.
  5. Same problem whether display driver radeon, amdgpu or modesetting.
  6. Same in multi-user.target using WINDOWMANAGER=startplasma-x11 startx.
  7. Same after emptying ~/.config/ and ~/.cache/, and regardless of user.
  8. zypper vecleared Plasma, KDE, dbus and QT6.

journalctl --no-hostname -b -p3 adds these two lines between reaching SDDM and Plasma login has been attempted:

Jan 18 13:39:10 systemd[1082]: dbus.socket: Socket service dbus.service not loaded, refusing.
Jan 18 13:39:10 systemd[1082]: Failed to listen on D-Bus User Message Bus Socket.
# journalctl --no-hostname -b -g dbus
Jan 18 13:37:13 dbus-broker-launch[706]: Invalid group-name in /etc/dbus-1/system.d/org.trinitydesktop.hardwarecontrol.conf +32: group="plugdev"
Jan 18 13:37:13 dbus-broker-launch[706]: Deprecated policy context in /etc/dbus-1/system.d/org.trinitydesktop.hardwarecontrol.conf +12. The 'at_console' context is deprecated and wil>
Jan 18 13:37:24 systemd[828]: dbus.socket: Socket service dbus.service not loaded, refusing.
Jan 18 13:37:35 systemd[864]: dbus.socket: Socket service dbus.service not loaded, refusing.
Jan 18 13:39:10 systemd[1082]: dbus.socket: Socket service dbus.service not loaded, refusing.

After reboot and starting a TDE session:

# journalctl --no-hostname -b -g dbus
Jan 18 13:55:36 dbus-broker-launch[708]: Invalid group-name in /etc/dbus-1/system.d/org.trinitydesktop.hardwarecontrol.conf +32: group="plugdev"
Jan 18 13:55:36 dbus-broker-launch[708]: Deprecated policy context in /etc/dbus-1/system.d/org.trinitydesktop.hardwarecontrol.conf +12. The 'at_console' context is deprecated and will be i>
Jan 18 13:55:46 systemd[827]: dbus.socket: Socket service dbus.service not loaded, refusing.
Jan 18 13:56:15 systemd[873]: dbus.socket: Socket service dbus.service not loaded, refusing.
Jan 18 13:56:16 systemd[1]: Created slice Slice /system/dbus-:1.4-org.trinitydesktop.hardwarecontrol.
Jan 18 13:56:16 systemd[1]: Started dbus-:1.4-org.trinitydesktop.hardwarecontrol@0.service.
Jan 18 13:56:16 tde_dbus_hardwarecontrol[1004]: [tde_dbus_hardwarecontrol] Listening...
Jan 18 13:56:17 tde_dbus_hardwarecontrol[1004]: [tde_dbus_hardwarecontrol] Name acquired: :1.18
Jan 18 13:56:18 tde_dbus_hardwarecontrol[1004]: [tde_dbus_hardwarecontrol] Name acquired: org.trinitydesktop.hardwarecontrol
#

Could a seeming TDE misconfiguration stop a Plasma session from working? What else to try or look at?

The dbus issue is relevant here - that will certainly stop Plasma form starting.
What do the following commands report?

rpm -q dbus
systemctl status dbus
systemctl enable --now dbus

D-Bus is trying to parse a group called plugdev in the TDE hardware control policy file. If that group doesn’t exist on the system, D-Bus considers it invalid and refuses to load that policy file.

Does the group exist?
getent group plugdev

# rpm -q dbus
package dbus is not installed
# systemctl status dbus
● dbus-broker.service - D-Bus System Message Bus
     Loaded: loaded (/usr/lib/systemd/system/dbus-broker.service; enabled; preset: enabled)
    Drop-In: /usr/lib/systemd/system/dbus-broker.service.d
             └─block-restart.conf
     Active: active (running) since Sun 2026-01-18 15:05:38 EST; 1min 27s ago
 Invocation: 09732325667447be87b8762a6b08fc8e
TriggeredBy: ● dbus.socket
       Docs: man:dbus-broker-launch(1)
   Main PID: 708 (dbus-broker-lau)
      Tasks: 2 (limit: 8219)
        CPU: 116ms
     CGroup: /system.slice/dbus-broker.service
             ├─708 /usr/bin/dbus-broker-launch --scope system --audit
             └─757 dbus-broker --log 10 --controller 9 --machine-id b39e265c6bc44cc1a72d749cc2ef2568 --max-bytes 536870912 --max-fds 4096 --max-matches 16384 --audit

Jan 18 15:05:38 ga88x systemd[1]: Starting D-Bus System Message Bus...
Jan 18 15:05:38 ga88x dbus-broker-launch[708]: Looking up NSS group entry for 'plugdev'...
Jan 18 15:05:38 ga88x dbus-broker-launch[708]: NSS returned no entry for 'plugdev'
Jan 18 15:05:38 ga88x dbus-broker-launch[708]: Invalid group-name in /etc/dbus-1/system.d/org.trinitydesktop.hardwarecontrol.conf +32: group="plugdev"
Jan 18 15:05:38 ga88x dbus-broker-launch[708]: Deprecated policy context in /etc/dbus-1/system.d/org.trinitydesktop.hardwarecontrol.conf +12. The 'at_console' context is deprecated and wil>
Jan 18 15:05:38 ga88x systemd[1]: Started D-Bus System Message Bus.
Jan 18 15:05:38 ga88x dbus-broker-launch[708]: Ready
 # systemctl enable --now dbus
Failed to enable unit: Refusing to operate on linked unit file dbus.service
# zypper in dbus
Loading repository data...
Reading installed packages...
'dbus' not found in package names. Trying capabilities.
No provider of 'dbus' found.
Resolving package dependencies...
Nothing to do.
# zypper --no-refresh se -s -i dbus | egrep -v 'debug|devel|srcp|openSUSE-20' | egrep 'x86|noarch'| sort -f
i  | dbus-1                    | package | 1.14.10-5.1              | x86_64 | OSS
i  | dbus-1-common             | package | 1.14.10-5.1              | noarch | OSS
i  | dbus-1-tools              | package | 1.14.10-5.1              | x86_64 | OSS
i  | dbus-broker               | package | 37-1.1                   | x86_64 | OSS
i  | dbus-broker-block-restart | package | 37-1.1                   | noarch | OSS
i  | kdbusaddons-tools         | package | 5.116.0-1.3              | x86_64 | OSS
i  | kf6-kdbusaddons           | package | 6.22.0-1.1               | x86_64 | OSS
i  | kf6-kdbusaddons-tools     | package | 6.22.0-1.1               | x86_64 | OSS
i  | libdbus-1-3               | package | 1.14.10-5.1              | x86_64 | OSS
i  | libdbus-1-tqt0            | package | 2:0.9-14.1.5_1.osstw     | x86_64 | TDE
i  | libdbus-tqt-1-0           | package | 2:0.63-14.1.5_1.osstw    | x86_64 | TDE
i  | libdbusmenu-qt5-2         | package | 0.9.3+16.04.20160218-3.1 | x86_64 | OSS
i  | libKF6DBusAddons6         | package | 6.22.0-1.1               | x86_64 | OSS
i  | libQCoro6DBus0            | package | 0.12.0-1.5               | x86_64 | OSS
i  | libQt6DBus6               | package | 6.10.1-2.1               | x86_64 | OSS
i  | perl-Net-DBus             | package | 1.2.0-1.27               | x86_64 | OSS
i  | qt6-tools-qdbus           | package | 6.10.1-1.2               | x86_64 | OSS
i+ | libKF5DBusAddons5         | package | 5.116.0-1.3              | x86_64 | OSS
i+ | libqt5-qdbus              | package | 5.15.18+kde3-2.2         | x86_64 | OSS
i+ | libQt5DBus5               | package | 5.15.18+kde109-1.2       | x86_64 | OSS
# getent group plugdev
# ls -gGhR /etc/dbus*
/etc/dbus-1:
total 16K
drwxr-xr-x 2 4.0K Dec 10 21:26 session.d
drwxr-xr-x 2 4.0K Dec 10 21:26 system.d
-rw-r--r-- 1  838 Dec 10 21:26 session.conf
-rw-r--r-- 1  833 Dec 10 21:26 system.conf

/etc/dbus-1/session.d:
total 0

/etc/dbus-1/system.d:
total 4.0K
-rw-r--r-- 1 2.9K Oct 27 08:48 org.trinitydesktop.hardwarecontrol.conf # ← 63 lines
#

TDE version was scheduled to go from 14.1.4 to 14.1.5 in October, but got held up until mid-November, so that ties into working in October but not November. I tried renaming the otherwise empty /etc/dbus-1/ to /etc/.dbus-1/ and rebooting. IceWM and TDE still worked, but Plasma wasn’t helped. I tried force removing libdbus-tqt-1-0 & libdbus-1-tqt-0and rebooting, but that didn’t help Plasma any. IceWM still worked, but not TDE, so I’ve reinstalled both.

/etc/dbus-1/system.d # grep -A17 plugdev org.trinitydesktop.hardwarecontrol.conf
  <policy group="plugdev">
  <!-- Users who are members of the plugdev group are allowed access -->
    <allow send_destination="org.trinitydesktop.hardwarecontrol"
           send_interface="org.freedesktop.DBus.Introspectable"/>

    <allow send_destination="org.trinitydesktop.hardwarecontrol"
           send_interface="org.freedesktop.DBus.Properties"/>

    <allow send_destination="org.trinitydesktop.hardwarecontrol"
           send_interface="org.trinitydesktop.hardwarecontrol"/>
    <allow send_destination="org.trinitydesktop.hardwarecontrol"
           send_interface="org.trinitydesktop.hardwarecontrol.Brightness"/>
    <allow send_destination="org.trinitydesktop.hardwarecontrol"
           send_interface="org.trinitydesktop.hardwarecontrol.CPUGovernor"/>
    <allow send_destination="org.trinitydesktop.hardwarecontrol"
           send_interface="org.trinitydesktop.hardwarecontrol.InputEvents"/>
    <allow send_destination="org.trinitydesktop.hardwarecontrol"
           send_interface="org.trinitydesktop.hardwarecontrol.Power"/>
  </policy>
#

That should really have been
zypper se -si dbus

Anyway, the dbus-broker.service output looks ok, but the following is problematic…

We really need to see the results from systemctl --user status dbus.socket.

# zypper --no-refresh se -s -i dbus | egrep -v 'debug|devel|srcp|openSUSE-20' | egrep 'x86|noarch'| sort -f | wc -l
20
# zypper se -si dbus | wc -l
25
# zypper se -si dbus | grep -vi dbus | wc -l
5

IOW, I posted an identical list of 20 installed packages already, using an alias zypsei that prints the command shown and its output, on 5 fewer lines than zypper se -si dbus. :sunglasses:

# systemctl --user status dbus.socket
○ dbus.socket - D-Bus User Message Bus Socket
     Loaded: loaded (/usr/lib/systemd/user/dbus.socket; static)
     Active: inactive (dead)
   Triggers: ● dbus.service
     Listen: /run/user/0/bus (Stream)

Jan 18 19:25:56 ga88x systemd[925]: dbus.socket: Socket service dbus.service not loaded, refusing.
Jan 18 19:25:56 ga88x systemd[925]: Failed to listen on D-Bus User Message Bus Socket.

zypper rm trinity* didn’t improve anything either. IceWM still works, but running $ systemctl --user status dbus.socket in an Xterm there produces the same output above pasted, while the same 20 dbus packages remain installed, and:

# journalctl -b -p3 -g dbus
Jan 18 19:51:27 ga88x systemd[814]: dbus.socket: Socket service dbus.service not loaded, refusing.
Jan 18 19:51:31 ga88x systemd[917]: dbus.socket: Socket service dbus.service not loaded, refusing.
Jan 18 19:52:52 ga88x systemd[1130]: dbus.socket: Socket service dbus.service not loaded, refusing.
Jan 18 19:54:16 ga88x systemd[1323]: dbus.socket: Socket service dbus.service not loaded, refusing.
#  alias | grep scluf
alias scluf='systemctl list-unit-files | sort | grep -E '
# scluf dbus
dbus-broker.service                         enabled         enabled
dbus-org.freedesktop.Avahi.service          alias           -
dbus-org.freedesktop.hostname1.service      alias           -
dbus-org.freedesktop.locale1.service        alias           -
dbus-org.freedesktop.login1.service         alias           -
dbus-org.freedesktop.network1.service       alias           -
dbus-org.freedesktop.timedate1.service      alias           -
dbus.service                                alias           -
dbus.socket                                 static          -
#

:worried:

So, you didn’t need to repeat it - I was just commenting re the rpm command I’d given in a hurry. :wink:

Anyway, the output you shared confirms the only user session bus is broken. TDE/IceWM work because they don’t require a full user D-Bus session, but Plasma does. I assume that the following can be used to launch a working Plamsa X11 session from a user TTY…
dbus-launch startplasma-x11

Speculating that the TDE D-Bus packages (libdbus-1-tqt0 and libdbus-tqt-1-0) are the issue here. They may be interfering with the user D-Bus session, which Plasma 6 requires.

No TDE packages remain installed. Plasma still won’t start from SDDM.

-bash: dbus-launch: command not found

Same whether root or user. In 15.6 that’s provided by dbus-1 package, which is installed in this TW, dbus-1-1.14.10-5.1 as above listed. :frowning:

Even though you mentioned removing TDE, are these still present?
zypper se -si libdbus-1-tqt0 libdbus-tqt-1-0

Can you try startx /usr/bin/startplasma-x11 from a TTY? For Plasma Wayland, it can be started without SDDM using startplasma-wayland directly. Do either of those result in a working Plasma desktop?

You may try:

  • journalctl --user --boot 0 --unit init.scope
  • journalctl --boot 0 --unit sddm.service --priority info
erlangen:~ # journalctl --boot 0 --unit sddm.service --priority info 
Jan 16 01:34:46 erlangen systemd[1]: Started Simple Desktop Display Manager.
Jan 16 01:34:47 erlangen sddm-helper[1349]: pam_unix(sddm-greeter:session): session opened for user sddm(uid=477) by sddm(uid=0)
Jan 16 01:34:47 erlangen sddm-helper[1349]: Starting X11 session: "" "/usr/bin/sddm-greeter-qt6 --socket /tmp/sddm-:0-FSaHdQ --theme /usr/share/sddm/themes/breeze-openSUSE"
Jan 16 01:34:54 erlangen sddm-helper[1426]: pam_unix(sddm:session): session opened for user karl(uid=1000) by karl(uid=0)
Jan 16 01:34:54 erlangen sddm-helper[1426]: Starting Wayland user session: "/usr/share/sddm/scripts/wayland-session" "/usr/libexec/plasma-dbus-run-session-if-needed /usr/bin/startplasma-wayland"
Jan 16 01:34:54 erlangen sddm-helper[1426]: Failed to write utmpx:  No such file or directory
Jan 16 07:14:13 erlangen sddm-helper[38390]: pam_unix(sddm-greeter:session): session opened for user sddm(uid=477) by sddm(uid=0)
Jan 16 07:14:13 erlangen sddm-helper[38390]: Starting X11 session: "" "/usr/bin/sddm-greeter-qt6 --socket /tmp/sddm-:2-qGOcAJ --theme /usr/share/sddm/themes/breeze-openSUSE"
Jan 16 07:14:20 erlangen sddm-helper[38445]: pam_unix(sddm:session): session opened for user charlemagne(uid=1001) by charlemagne(uid=0)
Jan 16 07:14:20 erlangen sddm-helper[38445]: Starting Wayland user session: "/usr/share/sddm/scripts/wayland-session" "/usr/libexec/plasma-dbus-run-session-if-needed /usr/bin/startplasma-wayland"
Jan 16 07:14:20 erlangen sddm-helper[38445]: Failed to write utmpx:  No such file or directory
Jan 17 06:02:09 erlangen sddm-helper[127223]: pam_unix(sddm-greeter:session): session opened for user sddm(uid=477) by sddm(uid=0)
Jan 17 06:02:09 erlangen sddm-helper[127223]: Starting X11 session: "" "/usr/bin/sddm-greeter-qt6 --socket /tmp/sddm-:4-COWZYr --theme /usr/share/sddm/themes/breeze-openSUSE"
Jan 17 06:02:14 erlangen sddm-helper[127278]: [PAM] Asked to close the session but it wasn't previously open
Jan 17 06:02:19 erlangen sddm[1167]: Error from greeter session: "Process crashed"
Jan 17 06:02:19 erlangen sddm[1167]: Auth: sddm-helper (--socket /tmp/sddm-auth-c004b446-d582-479d-b78e-545110b59df5 --id 6 --start /usr/bin/sddm-greeter-qt6 --socket /tmp/sddm-:4-COWZYr --theme /usr/share/sddm/themes/breeze-openSUSE ->
Jan 17 06:02:19 erlangen sddm[1167]: Error from greeter session: "Process crashed"
Jan 17 06:02:19 erlangen sddm[1167]: Auth: sddm-helper exited with 9
Jan 18 07:51:39 erlangen sddm-helper[225284]: pam_unix(sddm-greeter:session): session opened for user sddm(uid=477) by sddm(uid=0)
Jan 18 07:51:39 erlangen sddm-helper[225284]: Starting X11 session: "" "/usr/bin/sddm-greeter-qt6 --socket /tmp/sddm-:2-UrkQzG --theme /usr/share/sddm/themes/breeze-openSUSE"
Jan 18 07:51:45 erlangen sddm-helper[225339]: pam_unix(sddm:session): session opened for user charlemagne(uid=1001) by charlemagne(uid=0)
Jan 18 07:51:45 erlangen sddm-helper[225339]: Starting Wayland user session: "/usr/share/sddm/scripts/wayland-session" "/usr/libexec/plasma-dbus-run-session-if-needed /usr/bin/startplasma-wayland"
Jan 18 07:51:45 erlangen sddm-helper[225339]: Failed to write utmpx:  No such file or directory
erlangen:~ # 
1 Like
# journalctl --no-hostname --user --boot 0 --unit init.scope
Jan 19 01:47:09 (systemd)[874]: pam_unix(systemd-user:session): session opened for user sddm(uid=466) by sddm(uid=0)
Jan 19 01:47:17 (systemd)[914]: pam_unix(systemd-user:session): session opened for user tst2000(uid=2000) by tst2000(uid=0)
Jan 19 01:48:12 (systemd)[1047]: pam_unix(systemd-user:session): session opened for user root(uid=0) by root(uid=0)
Jan 19 01:48:13 systemd[1047]: Queued start job for default target Main User Target.
Jan 19 01:48:13 systemd[1047]: Created slice User Application Slice.
Jan 19 01:48:13 systemd[1047]: Started Submitting pending crash events (file monitor).
Jan 19 01:48:13 systemd[1047]: Cleanup lingering KCrash metadata was skipped because of an unmet condition check (ConditionPathExistsGlob=/root/.cache/kcrash-metadata/*.ini).
Jan 19 01:48:13 systemd[1047]: Submitting pending crash events was skipped because of an unmet condition check (ConditionPathExistsGlob=/root/.cache/drkonqi/sentry-envelopes/*).
Jan 19 01:48:13 systemd[1047]: Reached target Paths.
Jan 19 01:48:13 systemd[1047]: Reached target Timers.
Jan 19 01:48:13 systemd[1047]: dbus.socket: Socket service dbus.service not loaded, refusing.
Jan 19 01:48:13 systemd[1047]: Failed to listen on D-Bus User Message Bus Socket.
Jan 19 01:48:13 systemd[1047]: Socket to launch DrKonqi for a systemd-coredump crash was skipped because of an unmet condition check (ConditionUser=!@system).
Jan 19 01:48:13 systemd[1047]: Listening on PipeWire Multimedia System Sockets.
Jan 19 01:48:13 systemd[1047]: Reached target Sockets.
Jan 19 01:48:13 systemd[1047]: Reached target Basic System.
Jan 19 01:48:13 systemd[1047]: Cleanup lingering KCrash metadata was skipped because of an unmet condition check (ConditionPathExistsGlob=/root/.cache/kcrash-metadata/*.ini).
Jan 19 01:48:13 systemd[1047]: Reached target Main User Target.
Jan 19 01:48:13 systemd[1047]: Startup finished in 867ms.
ga88x:~ # journalctl --no-hostname --boot 0 --unit sddm.service --priority info
Jan 19 01:46:59 systemd[1]: Started Simple Desktop Display Manager.
Jan 19 01:47:09 sddm[778]: QProcess: Destroyed while process ("/usr/libexec/sddm/sddm-helper") is still running.
Jan 19 01:47:18 sddm-helper[905]: pam_unix(sddm:session): session opened for user tst2000(uid=2000) by tst2000(uid=0)
Jan 19 01:47:18 sddm-helper[905]: Starting X11 session: "" "/usr/etc/X11/xdm/Xsession \"/usr/bin/startplasma-x11\""
Jan 19 01:47:18 sddm-helper[905]: Failed to write utmpx:  No such file or directory
#

Oops! Forgot -u with zypper rm trinity*, but removing those two didn’t help, and there were still 3 other trinity *tqt* packages installed:

# zypper --no-refresh se -s -i tqt | egrep -v 'debug|devel|srcp|openSUSE-20' | egrep 'x86|noarch'| sort -f
i  | libavahi-tqt1      | package | 2:0.6.30-14.1.5_1.osstw | x86_64 | TDE
i  | libpackagekitqt6-2 | package | 1.1.4-1.1               | x86_64 | OSS
i  | libtqt3-mt         | package | 3.5.0-14.1.5_1.osstw    | x86_64 | TDE
i  | libtqt4            | package | 2:4.2.0-14.1.5_1.osstw  | x86_64 | TDE
#

Removing them didn’t help either.

# zypsei tqt
# zypper --no-refresh se -s -i tqt | egrep -v 'debug|devel|srcp|openSUSE-20' | egrep 'x86|noarch'| sort -f
i  | libpackagekitqt6-2 | package | 1.1.4-1.1 | x86_64 | OSS
# systemctl isolate multi-user
#
$ startx /usr/bin/startplasma-x11
xauth: file /home/tst2000/.serverauth.1164 does not exist

/bin/sh: /usr/bin/X: Permission denied
xinit: giving up
xinit: unable to connect to X server: Connection refused
xinit: server error
$
# ls -gGh /usr/bin/X
lrwxrwxrwx 1 4 Nov 25 07:36 /usr/bin/X -> Xorg
# ls -gGh /usr/bin/Xorg
-rws--x--x 1 273 Nov 25 07:36 /usr/bin/Xorg
#
$ /usr/bin/startplasma-wayland
startplasmacompositor: Could not start D-Bus. Can you call qdbus6?
$ qdbus6
Could not connect to D-Bus server: org.freedesktop.DBus.Error.NotSupported: Unable to autolaunch a dbus-daemon without a $DISPLAY for X11
$ WINDOWMANAGER=startplasma-x11 startx
xauth: file /home/tst2000/.serverauth.1219 does not exist

/bin/sh: /usr/bin/X: Permission denied
xinit: giving up
xinit: unable to connect to X server: Connection refused
xinit: server error
$
# WINDOWMANAGER=startplasma-x11 startx
<black screen + mouse pointer>

Startx as root tries to start a session, but same failure results as with SDDM.

Let’s stay with the D-Bus issue. The issue is that Plasma 6 requires a systemd-managed user D-Bus session, and your logs show it never activates.

Something to check…
grep pam_systemd.so /etc/pam.d/common-session-pc

# grep pam_systemd.so /etc/pam.d/common-session-pc
session optional        pam_systemd.so
#

OK, so PAM not the cause.

From a TTY (eg VT2) check the socket and environment variables

systemctl --user status dbus.socket
echo $XDG_RUNTIME_DIR
echo $DBUS_SESSION_BUS_ADDRESS

If the socket is active and the environment variables set try invoking startplasma-wayland. Report back.

Perhaps also journalctl --user -b -g dbus for any reported socket issue.

# systemctl --user status dbus.socket
○ dbus.socket - D-Bus User Message Bus Socket
     Loaded: loaded (/usr/lib/systemd/user/dbus.socket; static)
     Active: inactive (dead)
   Triggers: ● dbus.service
     Listen: /run/user/2000/bus (Stream)

Jan 19 03:05:31 ga88x systemd[1307]: dbus.socket: Socket service dbus.service not loaded, refusing.
Jan 19 03:05:31 ga88x systemd[1307]: Failed to listen on D-Bus User Message Bus Socket.
Jan 19 03:07:02 ga88x systemd[1544]: dbus.socket: Socket service dbus.service not loaded, refusing.
Jan 19 03:07:02 ga88x systemd[1544]: Failed to listen on D-Bus User Message Bus Socket.
# echo $XDG_RUNTIME_DIR
/run/user/2000
# echo $DBUS_SESSION_BUS_ADDRESS

# journalctl --no-hostname --user -b -g dbus
Jan 19 03:05:31 systemd[1307]: dbus.socket: Socket service dbus.service not loaded, refusing.
Jan 19 03:05:53 systemd-coredump[1443]: Process 1407 (ksplashqml) of user 2000 dumped core.

                                        Stack trace of thread 1432:
                                        #0  0x00007f15bab77c34 _ZN15QRecursiveMutex7tryLockE14QDeadlineTimer (libQt6Core.so.6 + 0x377c34)
                                        #1  0x00007f15bb5edc02 n/a (libQt6Gui.so.6 + 0x5edc02)
                                        #2  0x00007f15bb5f2c61 n/a (libQt6Gui.so.6 + 0x5f2c61)
                                        #3  0x00007f15bb5feddd n/a (libQt6Gui.so.6 + 0x5feddd)
                                        #4  0x00007f15bb60342f n/a (libQt6Gui.so.6 + 0x60342f)
                                        #5  0x00007f15bb48561b _ZN4QRhi8endFrameEP13QRhiSwapChain6QFlagsINS_12EndFrameFlagEE (libQt6Gui.so.6 + 0x48561b)
                                        #6  0x00007f15bc5450f6 n/a (libQt6Quick.so.6 + 0x5450f6)
                                        #7  0x00007f15bab71e68 n/a (libQt6Core.so.6 + 0x371e68)
                                        #8  0x00007f15ba09bdf1 start_thread (libc.so.6 + 0x9bdf1)
                                        #9  0x00007f15ba120c8c __clone3 (libc.so.6 + 0x120c8c)

                                        Stack trace of thread 1407:
                                        #0  0x00007f15ba0a4812 __syscall_cancel_arch (libc.so.6 + 0xa4812)
                                        #1  0x00007f15ba098008 __internal_syscall_cancel (libc.so.6 + 0x98008)
                                        #2  0x00007f15ba0987cc __futex_abstimed_wait_common (libc.so.6 + 0x987cc)
                                        #3  0x00007f15ba09b308 pthread_cond_wait@@GLIBC_2.3.2 (libc.so.6 + 0x9b308)
                                        #4  0x00007f15bab73f94 _ZN14QWaitCondition4waitEP6QMutex14QDeadlineTimer (libQt6Core.so.6 + 0x373f94)
                                        #5  0x00007f15bc542e64 n/a (libQt6Quick.so.6 + 0x542e64)
                                        #6  0x00007f15bc543cdd n/a (libQt6Quick.so.6 + 0x543cdd)
                                        #7  0x00007f15bc323dec _ZN12QQuickWindowD2Ev (libQt6Quick.so.6 + 0x323dec)
                                        #8  0x000055dabe6a53ff n/a (/usr/bin/ksplashqml + 0x73ff)
                                        #9  0x000055dabe6a5090 n/a (/usr/bin/ksplashqml + 0x7090)
                                        #10 0x000055dabe6a48b9 n/a (/usr/bin/ksplashqml + 0x68b9)
                                        #11 0x00007f15ba02b2fb __libc_start_call_main (libc.so.6 + 0x2b2fb)
                                        #12 0x00007f15ba02b3cb __libc_start_main@@GLIBC_2.34 (libc.so.6 + 0x2b3cb)
                                        #13 0x000055dabe6a4c75 n/a (/usr/bin/ksplashqml + 0x6c75)

                                        Stack trace of thread 1434:
                                        #0  0x00007f15ba0a4812 __syscall_cancel_arch (libc.so.6 + 0xa4812)
                                        #1  0x00007f15ba098008 __internal_syscall_cancel (libc.so.6 + 0x98008)
                                        #2  0x00007f15ba0987cc __futex_abstimed_wait_common (libc.so.6 + 0x987cc)
                                        #3  0x00007f15ba09b308 pthread_cond_wait@@GLIBC_2.3.2 (libc.so.6 + 0x9b308)
                                        #4  0x00007f15ace74549 n/a (libgallium-25.3.3.so + 0x674549)
                                        #5  0x00007f15ace2b57c n/a (libgallium-25.3.3.so + 0x62b57c)
                                        #6  0x00007f15ace74487 n/a (libgallium-25.3.3.so + 0x674487)
                                        #7  0x00007f15ba09bdf1 start_thread (libc.so.6 + 0x9bdf1)
                                        #8  0x00007f15ba120c8c __clone3 (libc.so.6 + 0x120c8c)

                                        Stack trace of thread 1409:
                                        #0  0x00007f15ba0a4812 __syscall_cancel_arch (libc.so.6 + 0xa4812)
                                        #1  0x00007f15ba098008 __internal_syscall_cancel (libc.so.6 + 0x98008)
                                        #2  0x00007f15ba098061 __syscall_cancel (libc.so.6 + 0x98061)
                                        #3  0x00007f15ba112f32 ppoll (libc.so.6 + 0x112f32)
                                        #4  0x00007f15b8aacb1f n/a (libglib-2.0.so.0 + 0x62b1f)
                                        #5  0x00007f15b8aad26c g_main_context_iteration (libglib-2.0.so.0 + 0x6326c)
                                        #6  0x00007f15bac8ca28 _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt6Core.so.6 + 0x48ca28)
                                        #7  0x00007f15ba9dc1ab _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt6Core.so.6 + 0x1dc1ab)
                                        #8  0x00007f15baae1679 _ZN7QThread4execEv (libQt6Core.so.6 + 0x2e1679)
                                        #9  0x00007f15bc8d6abe n/a (libQt6DBus.so.6 + 0x44abe)
                                        #10 0x00007f15bab71e68 n/a (libQt6Core.so.6 + 0x371e68)
                                        #11 0x00007f15ba09bdf1 start_thread (libc.so.6 + 0x9bdf1)
                                        #12 0x00007f15ba120c8c __clone3 (libc.so.6 + 0x120c8c)

                                        Stack trace of thread 1421:
                                        #0  0x00007f15ba0a4812 __syscall_cancel_arch (libc.so.6 + 0xa4812)
                                        #1  0x00007f15ba098008 __internal_syscall_cancel (libc.so.6 + 0x98008)
                                        #2  0x00007f15ba098061 __syscall_cancel (libc.so.6 + 0x98061)
                                        #3  0x00007f15ba112f32 ppoll (libc.so.6 + 0x112f32)
                                        #4  0x00007f15b8aacb1f n/a (libglib-2.0.so.0 + 0x62b1f)
                                        #5  0x00007f15b8aad26c g_main_context_iteration (libglib-2.0.so.0 + 0x6326c)
                                        #6  0x00007f15bac8ca28 _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt6Core.so.6 + 0x48ca28)
                                        #7  0x00007f15ba9dc1ab _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt6Core.so.6 + 0x1dc1ab)
                                        #8  0x00007f15baae1679 _ZN7QThread4execEv (libQt6Core.so.6 + 0x2e1679)
                                        #9  0x00007f15bab71e68 n/a (libQt6Core.so.6 + 0x371e68)
                                        #10 0x00007f15ba09bdf1 start_thread (libc.so.6 + 0x9bdf1)
                                        #11 0x00007f15ba120c8c __clone3 (libc.so.6 + 0x120c8c)

                                        Stack trace of thread 1422:
                                        #0  0x00007f15ba0a4812 __syscall_cancel_arch (libc.so.6 + 0xa4812)
                                        #1  0x00007f15ba098008 __internal_syscall_cancel (libc.so.6 + 0x98008)
                                        #2  0x00007f15ba098061 __syscall_cancel (libc.so.6 + 0x98061)
                                        #3  0x00007f15ba112f32 ppoll (libc.so.6 + 0x112f32)
                                        #4  0x00007f15b8aacb1f n/a (libglib-2.0.so.0 + 0x62b1f)
                                        #5  0x00007f15b8aad26c g_main_context_iteration (libglib-2.0.so.0 + 0x6326c)
                                        #6  0x00007f15bac8ca28 _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt6Core.so.6 + 0x48ca28)
                                        #7  0x00007f15ba9dc1ab _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt6Core.so.6 + 0x1dc1ab)
                                        #8  0x00007f15baae1679 _ZN7QThread4execEv (libQt6Core.so.6 + 0x2e1679)
                                        #9  0x00007f15bc468b9b n/a (libQt6Quick.so.6 + 0x468b9b)
                                        #10 0x00007f15bab71e68 n/a (libQt6Core.so.6 + 0x371e68)
                                        #11 0x00007f15ba09bdf1 start_thread (libc.so.6 + 0x9bdf1)
                                        #12 0x00007f15ba120c8c __clone3 (libc.so.6 + 0x120c8c)

                                        Stack trace of thread 1428:
                                        #0  0x00007f15ba0a4812 __syscall_cancel_arch (libc.so.6 + 0xa4812)
                                        #1  0x00007f15ba098008 __internal_syscall_cancel (libc.so.6 + 0x98008)
                                        #2  0x00007f15ba0987cc __futex_abstimed_wait_common (libc.so.6 + 0x987cc)
                                        #3  0x00007f15ba09b308 pthread_cond_wait@@GLIBC_2.3.2 (libc.so.6 + 0x9b308)
                                        #4  0x00007f15ace74549 n/a (libgallium-25.3.3.so + 0x674549)
                                        #5  0x00007f15ace2b57c n/a (libgallium-25.3.3.so + 0x62b57c)
                                        #6  0x00007f15ace74487 n/a (libgallium-25.3.3.so + 0x674487)
                                        #7  0x00007f15ba09bdf1 start_thread (libc.so.6 + 0x9bdf1)
                                        #8  0x00007f15ba120c8c __clone3 (libc.so.6 + 0x120c8c)

                                        Stack trace of thread 1427:
                                        #0  0x00007f15ba0a4812 __syscall_cancel_arch (libc.so.6 + 0xa4812)
                                        #1  0x00007f15ba098008 __internal_syscall_cancel (libc.so.6 + 0x98008)
                                        #2  0x00007f15ba0987cc __futex_abstimed_wait_common (libc.so.6 + 0x987cc)
                                        #3  0x00007f15ba09b308 pthread_cond_wait@@GLIBC_2.3.2 (libc.so.6 + 0x9b308)
                                        #4  0x00007f15ace74549 n/a (libgallium-25.3.3.so + 0x674549)
                                        #5  0x00007f15ace2b57c n/a (libgallium-25.3.3.so + 0x62b57c)
                                        #6  0x00007f15ace74487 n/a (libgallium-25.3.3.so + 0x674487)
                                        #7  0x00007f15ba09bdf1 start_thread (libc.so.6 + 0x9bdf1)
                                        #8  0x00007f15ba120c8c __clone3 (libc.so.6 + 0x120c8c)

                                        Stack trace of thread 1410:
                                        #0  0x00007f15ba0a4812 __syscall_cancel_arch (libc.so.6 + 0xa4812)
                                        #1  0x00007f15ba098008 __internal_syscall_cancel (libc.so.6 + 0x98008)
                                        #2  0x00007f15ba0987cc __futex_abstimed_wait_common (libc.so.6 + 0x987cc)
                                        #3  0x00007f15ba09b308 pthread_cond_wait@@GLIBC_2.3.2 (libc.so.6 + 0x9b308)
                                        #4  0x00007f15ace74549 n/a (libgallium-25.3.3.so + 0x674549)
                                        #5  0x00007f15ace2b57c n/a (libgallium-25.3.3.so + 0x62b57c)
                                        #6  0x00007f15ace74487 n/a (libgallium-25.3.3.so + 0x674487)
                                        #7  0x00007f15ba09bdf1 start_thread (libc.so.6 + 0x9bdf1)
                                        #8  0x00007f15ba120c8c __clone3 (libc.so.6 + 0x120c8c)

                                        Stack trace of thread 1412:
                                        #0  0x00007f15ba0a4812 __syscall_cancel_arch (libc.so.6 + 0xa4812)
                                        #1  0x00007f15ba098008 __internal_syscall_cancel (libc.so.6 + 0x98008)
                                        #2  0x00007f15ba0987cc __futex_abstimed_wait_common (libc.so.6 + 0x987cc)
                                        #3  0x00007f15ba09b308 pthread_cond_wait@@GLIBC_2.3.2 (libc.so.6 + 0x9b308)
                                        #4  0x00007f15ace74549 n/a (libgallium-25.3.3.so + 0x674549)
                                        #5  0x00007f15ace2b57c n/a (libgallium-25.3.3.so + 0x62b57c)
                                        #6  0x00007f15ace74487 n/a (libgallium-25.3.3.so + 0x674487)
                                        #7  0x00007f15ba09bdf1 start_thread (libc.so.6 + 0x9bdf1)
                                        #8  0x00007f15ba120c8c __clone3 (libc.so.6 + 0x120c8c)

                                        Stack trace of thread 1426:
                                        #0  0x00007f15ba0a4812 __syscall_cancel_arch (libc.so.6 + 0xa4812)
                                        #1  0x00007f15ba098008 __internal_syscall_cancel (libc.so.6 + 0x98008)
                                        #2  0x00007f15ba0987cc __futex_abstimed_wait_common (libc.so.6 + 0x987cc)
                                        #3  0x00007f15ba09b308 pthread_cond_wait@@GLIBC_2.3.2 (libc.so.6 + 0x9b308)
                                        #4  0x00007f15ace74549 n/a (libgallium-25.3.3.so + 0x674549)
                                        #5  0x00007f15ace2b57c n/a (libgallium-25.3.3.so + 0x62b57c)
                                        #6  0x00007f15ace74487 n/a (libgallium-25.3.3.so + 0x674487)
                                        #7  0x00007f15ba09bdf1 start_thread (libc.so.6 + 0x9bdf1)
                                        #8  0x00007f15ba120c8c __clone3 (libc.so.6 + 0x120c8c)

                                        Stack trace of thread 1413:
                                        #0  0x00007f15ba0a4812 __syscall_cancel_arch (libc.so.6 + 0xa4812)
                                        #1  0x00007f15ba098008 __internal_syscall_cancel (libc.so.6 + 0x98008)
                                        #2  0x00007f15ba0987cc __futex_abstimed_wait_common (libc.so.6 + 0x987cc)
                                        #3  0x00007f15ba09b308 pthread_cond_wait@@GLIBC_2.3.2 (libc.so.6 + 0x9b308)
                                        #4  0x00007f15ace74549 n/a (libgallium-25.3.3.so + 0x674549)
                                        #5  0x00007f15ace2b57c n/a (libgallium-25.3.3.so + 0x62b57c)
                                        #6  0x00007f15ace74487 n/a (libgallium-25.3.3.so + 0x674487)
                                        #7  0x00007f15ba09bdf1 start_thread (libc.so.6 + 0x9bdf1)
                                        #8  0x00007f15ba120c8c __clone3 (libc.so.6 + 0x120c8c)

                                        Stack trace of thread 1429:
                                        #0  0x00007f15ba0a4812 __syscall_cancel_arch (libc.so.6 + 0xa4812)
                                        #1  0x00007f15ba098008 __internal_syscall_cancel (libc.so.6 + 0x98008)
                                        #2  0x00007f15ba0987cc __futex_abstimed_wait_common (libc.so.6 + 0x987cc)
                                        #3  0x00007f15ba09b308 pthread_cond_wait@@GLIBC_2.3.2 (libc.so.6 + 0x9b308)
                                        #4  0x00007f15ace74549 n/a (libgallium-25.3.3.so + 0x674549)
                                        #5  0x00007f15ace2b57c n/a (libgallium-25.3.3.so + 0x62b57c)
                                        #6  0x00007f15ace74487 n/a (libgallium-25.3.3.so + 0x674487)
                                        #7  0x00007f15ba09bdf1 start_thread (libc.so.6 + 0x9bdf1)
                                        #8  0x00007f15ba120c8c __clone3 (libc.so.6 + 0x120c8c)

                                        Stack trace of thread 1411:
                                        #0  0x00007f15ba0a4812 __syscall_cancel_arch (libc.so.6 + 0xa4812)
                                        #1  0x00007f15ba098008 __internal_syscall_cancel (libc.so.6 + 0x98008)
                                        #2  0x00007f15ba0987cc __futex_abstimed_wait_common (libc.so.6 + 0x987cc)
                                        #3  0x00007f15ba09b308 pthread_cond_wait@@GLIBC_2.3.2 (libc.so.6 + 0x9b308)
                                        #4  0x00007f15ace74549 n/a (libgallium-25.3.3.so + 0x674549)
                                        #5  0x00007f15ace2b57c n/a (libgallium-25.3.3.so + 0x62b57c)
                                        #6  0x00007f15ace74487 n/a (libgallium-25.3.3.so + 0x674487)
                                        #7  0x00007f15ba09bdf1 start_thread (libc.so.6 + 0x9bdf1)
                                        #8  0x00007f15ba120c8c __clone3 (libc.so.6 + 0x120c8c)

                                        Stack trace of thread 1414:
                                        #0  0x00007f15ba0a4812 __syscall_cancel_arch (libc.so.6 + 0xa4812)
                                        #1  0x00007f15ba098008 __internal_syscall_cancel (libc.so.6 + 0x98008)
                                        #2  0x00007f15ba0987cc __futex_abstimed_wait_common (libc.so.6 + 0x987cc)
                                        #3  0x00007f15ba09b308 pthread_cond_wait@@GLIBC_2.3.2 (libc.so.6 + 0x9b308)
                                        #4  0x00007f15ace74549 n/a (libgallium-25.3.3.so + 0x674549)
                                        #5  0x00007f15ace2b57c n/a (libgallium-25.3.3.so + 0x62b57c)
                                        #6  0x00007f15ace74487 n/a (libgallium-25.3.3.so + 0x674487)
                                        #7  0x00007f15ba09bdf1 start_thread (libc.so.6 + 0x9bdf1)
                                        #8  0x00007f15ba120c8c __clone3 (libc.so.6 + 0x120c8c)

                                        Stack trace of thread 1415:
                                        #0  0x00007f15ba0a4812 __syscall_cancel_arch (libc.so.6 + 0xa4812)
                                        #1  0x00007f15ba098008 __internal_syscall_cancel (libc.so.6 + 0x98008)
                                        #2  0x00007f15ba0987cc __futex_abstimed_wait_common (libc.so.6 + 0x987cc)
                                        #3  0x00007f15ba09b308 pthread_cond_wait@@GLIBC_2.3.2 (libc.so.6 + 0x9b308)
                                        #4  0x00007f15ace74549 n/a (libgallium-25.3.3.so + 0x674549)
                                        #5  0x00007f15ace2b57c n/a (libgallium-25.3.3.so + 0x62b57c)
                                        #6  0x00007f15ace74487 n/a (libgallium-25.3.3.so + 0x674487)
                                        #7  0x00007f15ba09bdf1 start_thread (libc.so.6 + 0x9bdf1)
                                        #8  0x00007f15ba120c8c __clone3 (libc.so.6 + 0x120c8c)

                                        Stack trace of thread 1416:
                                        #0  0x00007f15ba0a4812 __syscall_cancel_arch (libc.so.6 + 0xa4812)
                                        #1  0x00007f15ba098008 __internal_syscall_cancel (libc.so.6 + 0x98008)
                                        #2  0x00007f15ba0987cc __futex_abstimed_wait_common (libc.so.6 + 0x987cc)
                                        #3  0x00007f15ba09b308 pthread_cond_wait@@GLIBC_2.3.2 (libc.so.6 + 0x9b308)
                                        #4  0x00007f15ace74549 n/a (libgallium-25.3.3.so + 0x674549)
                                        #5  0x00007f15ace2b57c n/a (libgallium-25.3.3.so + 0x62b57c)
                                        #6  0x00007f15ace74487 n/a (libgallium-25.3.3.so + 0x674487)
                                        #7  0x00007f15ba09bdf1 start_thread (libc.so.6 + 0x9bdf1)
                                        #8  0x00007f15ba120c8c __clone3 (libc.so.6 + 0x120c8c)

                                        Stack trace of thread 1425:
                                        #0  0x00007f15ba0a4812 __syscall_cancel_arch (libc.so.6 + 0xa4812)
                                        #1  0x00007f15ba098008 __internal_syscall_cancel (libc.so.6 + 0x98008)
                                        #2  0x00007f15ba0987cc __futex_abstimed_wait_common (libc.so.6 + 0x987cc)
                                        #3  0x00007f15ba09daf4 __pthread_clockjoin_ex (libc.so.6 + 0x9daf4)
                                        #4  0x00007f15ace746fe n/a (libgallium-25.3.3.so + 0x6746fe)
                                        #5  0x00007f15ace2b326 n/a (libgallium-25.3.3.so + 0x62b326)
                                        #6  0x00007f15ace2b3ac n/a (libgallium-25.3.3.so + 0x62b3ac)
                                        #7  0x00007f15ba0453d1 __run_exit_handlers (libc.so.6 + 0x453d1)
                                        #8  0x00007f15ba0454b0 exit (libc.so.6 + 0x454b0)
                                        #9  0x00007f15b90f716b _XDefaultIOError (libX11.so.6 + 0x4516b)
                                        #10 0x00007f15b90f9fdf _XIOError (libX11.so.6 + 0x47fdf)
                                        #11 0x00007f15b90ff308 _XFlush (libX11.so.6 + 0x4d308)
                                        #12 0x00007f15b90ff5bd _XGetRequest (libX11.so.6 + 0x4d5bd)
                                        #13 0x00007f15af3c3ea1 n/a (libGLX_mesa.so.0 + 0x29ea1)
                                        #14 0x00007f15b402cd9d n/a (libqxcb-glx-integration.so + 0xad9d)
                                        #15 0x00007f15bb5e9dfa _ZN14QOpenGLContext7destroyEv (libQt6Gui.so.6 + 0x5e9dfa)
                                        #16 0x00007f15bb5e9e70 _ZN14QOpenGLContextD1Ev (libQt6Gui.so.6 + 0x5e9e70)
                                        #17 0x00007f15bb5fa220 n/a (libQt6Gui.so.6 + 0x5fa220)
                                        #18 0x00007f15bb47ce72 _ZN4QRhiD1Ev (libQt6Gui.so.6 + 0x47ce72)
                                        #19 0x00007f15bc3f422b _ZN13QSGRhiSupport10destroyRhiEP4QRhiRK27QQuickGraphicsConfiguration (libQt6Quick.so.6 + 0x3f422b)
                                        #20 0x00007f15bc542516 n/a (libQt6Quick.so.6 + 0x542516)
                                        #21 0x00007f15bc5457bf n/a (libQt6Quick.so.6 + 0x5457bf)
                                        #22 0x00007f15bab71e68 n/a (libQt6Core.so.6 + 0x371e68)
                                        #23 0x00007f15ba09bdf1 start_thread (libc.so.6 + 0x9bdf1)
                                        #24 0x00007f15ba120c8c __clone3 (libc.so.6 + 0x120c8c)

                                        Stack trace of thread 1433:
                                        #0  0x00007f15ba0a4812 __syscall_cancel_arch (libc.so.6 + 0xa4812)
                                        #1  0x00007f15ba098008 __internal_syscall_cancel (libc.so.6 + 0x98008)
                                        #2  0x00007f15ba0987cc __futex_abstimed_wait_common (libc.so.6 + 0x987cc)
                                        #3  0x00007f15ba09b308 pthread_cond_wait@@GLIBC_2.3.2 (libc.so.6 + 0x9b308)
                                        #4  0x00007f15ace74549 n/a (libgallium-25.3.3.so + 0x674549)
                                        #5  0x00007f15ace2b57c n/a (libgallium-25.3.3.so + 0x62b57c)
                                        #6  0x00007f15ace74487 n/a (libgallium-25.3.3.so + 0x674487)
                                        #7  0x00007f15ba09bdf1 start_thread (libc.so.6 + 0x9bdf1)
                                        #8  0x00007f15ba120c8c __clone3 (libc.so.6 + 0x120c8c)
                                        ELF object binary architecture: AMD x86-64
Jan 19 03:07:02 systemd[1544]: dbus.socket: Socket service dbus.service not loaded, refusing.
# /lib64/ld-linux-x86-64.so.2 --help | tail -4
Subdirectories of glibc-hwcaps directories, in priority order:
  x86-64-v4
  x86-64-v3
  x86-64-v2 (supported, searched)
#

Need sleep…

You need to be running these as user.

$ systemctl --user status dbus.socket
○ dbus.socket - D-Bus User Message Bus Socket
     Loaded: loaded (/usr/lib/systemd/user/dbus.socket; static5:185m)
     Active: inactive (dead)
   Triggers: ● dbus.service
     Listen: /run/user/2000/bus (Stream)

Jan 19 07:57:34 ga88x systemd[919]: dbus.socket: Socket service dbus.service not loaded, refusing.
Jan 19 07:57:34 ga88x systemd[919]: Failed to listen on D-Bus User Message Bus Socket.
$ echo $XDG_RUNTIME_DIR
/run/user/2000
$ echo $DBUS_SESSION_BUS_ADDRESS

$ journalctl --no-hostname --user -b -g dbus
Jan 19 07:57:34 systemd[919]: dbus.socket: Socket service dbus.service not loaded, refusing.
$

Show what systemctl --user show dbus.socket -p Triggers returns.

It should return dbus-broker.service, but yours will likely show dbus.service.