Hi !
I have just updated my TW system to 20261023. My external screen is not usable any more (windows and mouse out of control, blinking, messy).
I have a laptop 1920x1080, nvidia 595.104.02, and an external screen 1920x1200 connected by DisplayPort.
Thanks for your help.
Posting the result of inxi -GSaz might help.
Thanks !
I made a test [1-with] and [2-without] external screen.
inxi -GSaz :
1- Without external screen :
System:
Kernel: 7.3.0-1-default arch: x86_64 bits: 64 compiler: gcc v: 16.2.1
clocksource: tsc avail: hpet,acpi_pm
parameters: BOOT_IMAGE=/boot/vmlinuz-7.3.0-1-default
root=UUID=47e0814e-562c-4e32-b1d0-d38c886eb124 security=selinux selinux=1
mitigations=auto rd.driver.blacklist=nouveau
Console: pty pts/0 wm: kwin_wayland DM: SDDM Distro: openSUSE Tumbleweed
20261023
Graphics:
Device-1: Intel CoffeeLake-H GT2 [UHD Graphics 630] vendor: Hewlett-Packard
driver: i915 v: kernel arch: Gen-9.5 process: Intel 14nm built: 2016-20
ports: active: eDP-1 empty: DP-1, DP-2, DP-3, HDMI-A-1, HDMI-A-2, HDMI-A-3
bus-ID: 00:02.0 chip-ID: 8086:3e9b class-ID: 0300
Device-2: NVIDIA TU104GLM [Quadro RTX 4000 Mobile / Max-Q]
vendor: Hewlett-Packard driver: nvidia v: 595.104.02
alternate: nouveau,nvidia_drm non-free: 550-6xx.xx+
status: current (as of 2026-07) arch: Turing code: TUxxx
process: TSMC 12nm FF built: 2018-2022 pcie: gen: 1 speed: 2.5 GT/s
lanes: 16 link-max: gen: 3 speed: 8 GT/s ports: active: none
empty: DP-4,DP-5,DP-6 bus-ID: 01:00.0 chip-ID: 10de:1eb6 class-ID: 0300
Device-3: Quanta HP HD Camera driver: uvcvideo type: USB rev: 2.0
speed: 480 Mb/s lanes: 1 mode: 2.0 bus-ID: 1-7:3 chip-ID: 0408:5373
class-ID: 0e02 serial:
Display: unspecified server: X.org v: 1.21.1.25 with: Xwayland v: 24.1.14
compositor: kwin_wayland driver: X: loaded: modesetting,nvidia
unloaded: vesa alternate: fbdev,intel,nouveau,nv dri: iris gpu: i915
display-ID: :1 screens: 1
Screen-1: 0 s-res: 1920x1080 s-dpi: 96 s-size: 508x285mm (20.00x11.22")
s-diag: 582mm (22.93")
Monitor-1: eDP-1 model: ChiMei InnoLux 0x175e built: 2018 res:
mode: 1920x1080 hz: 60 scale: 100% (1) dpi: 128 gamma: 1.2
size: 381x214mm (15x8.43") diag: 437mm (17.2") ratio: 16:9
modes: 1920x1080
API: EGL v: 1.5 hw: drv: intel iris drv: nvidia platforms: device: 0
drv: nvidia device: 2 drv: iris device: 3 drv: swrast gbm: drv: nvidia
surfaceless: drv: nvidia x11: drv: iris inactive: wayland,device-1
API: OpenGL v: 4.6.0 compat-v: 4.6 vendor: intel mesa v: 26.2.5 glx-v: 1.4
direct-render: yes renderer: Mesa Intel UHD Graphics 630 (CFL GT2)
device-ID: 8086:3e9b memory: 30.41 GiB unified: yes
API: Vulkan v: 1.4.363 layers: 3 device: 0 type: integrated-gpu name: Intel
UHD Graphics 630 (CFL GT2) driver: mesa intel v: 26.2.5
device-ID: 8086:3e9b surfaces: N/A device: 1 type: discrete-gpu
name: Quadro RTX 4000 driver: nvidia v: 595.104.02 device-ID: 10de:1eb6
surfaces: N/A device: 2 type: cpu name: llvmpipe (LLVM 23.1.3 256 bits)
driver: mesa llvmpipe v: 26.2.5 (LLVM 23.1.3) device-ID: 10005:0000
surfaces: N/A
Info: Tools: api: clinfo, eglinfo, glxinfo, vulkaninfo
de: kscreen-console,kscreen-doctor gpu: nvidia-settings,nvidia-smi
wl: wayland-info x11: xdpyinfo, xprop, xrandr
2- With external screen connected on DisplayPort :
System:
Kernel: 7.3.0-1-default arch: x86_64 bits: 64 compiler: gcc v: 16.2.1
clocksource: tsc avail: hpet,acpi_pm
parameters: BOOT_IMAGE=/boot/vmlinuz-7.3.0-1-default
root=UUID=47e0814e-562c-4e32-b1d0-d38c886eb124 security=selinux selinux=1
mitigations=auto rd.driver.blacklist=nouveau
Console: pty pts/0 wm: kwin_wayland DM: SDDM Distro: openSUSE Tumbleweed
20261023
Graphics:
Device-1: Intel CoffeeLake-H GT2 [UHD Graphics 630] vendor: Hewlett-Packard
driver: i915 v: kernel arch: Gen-9.5 process: Intel 14nm built: 2016-20
ports: active: eDP-1 empty: DP-1, DP-2, DP-3, HDMI-A-1, HDMI-A-2, HDMI-A-3
bus-ID: 00:02.0 chip-ID: 8086:3e9b class-ID: 0300
Device-2: NVIDIA TU104GLM [Quadro RTX 4000 Mobile / Max-Q]
vendor: Hewlett-Packard driver: nvidia v: 595.104.02
alternate: nouveau,nvidia_drm non-free: 550-6xx.xx+
status: current (as of 2026-07) arch: Turing code: TUxxx
process: TSMC 12nm FF built: 2018-2022 pcie: gen: 1 speed: 2.5 GT/s
lanes: 16 link-max: gen: 3 speed: 8 GT/s ports: active: DP-5
empty: DP-4,DP-6 bus-ID: 01:00.0 chip-ID: 10de:1eb6 class-ID: 0300
Device-3: Quanta HP HD Camera driver: uvcvideo type: USB rev: 2.0
speed: 480 Mb/s lanes: 1 mode: 2.0 bus-ID: 1-7:3 chip-ID: 0408:5373
class-ID: 0e02 serial:
Display: unspecified server: X.org v: 1.21.1.25 with: Xwayland v: 24.1.14
compositor: kwin_wayland driver: X: loaded: modesetting,nvidia
unloaded: vesa alternate: fbdev,intel,nouveau,nv dri: iris
gpu: i915,nv_platform,nvidia,nvidia-nvswitch display-ID: :1 screens: 1
Screen-1: 0 s-res: 1920x1080 s-dpi: 96 s-size: 508x285mm (20.00x11.22")
s-diag: 582mm (22.93")
Monitor-1: eDP-1 res: mode: 1920x1080 hz: 60 scale: 100% (1) dpi: 128
size: 381x214mm (15x8.43") diag: 437mm (17.2") modes: N/A
API: EGL v: 1.5 hw: drv: intel iris drv: nvidia platforms: device: 0
drv: nvidia device: 2 drv: iris device: 3 drv: swrast gbm: drv: nvidia
surfaceless: drv: nvidia x11: drv: iris inactive: wayland,device-1
API: OpenGL v: 4.6.0 compat-v: 4.6 vendor: intel mesa v: 26.2.5 glx-v: 1.4
direct-render: yes renderer: Mesa Intel UHD Graphics 630 (CFL GT2)
device-ID: 8086:3e9b memory: 30.41 GiB unified: yes
API: Vulkan v: 1.4.363 layers: 3 device: 0 type: integrated-gpu name: Intel
UHD Graphics 630 (CFL GT2) driver: mesa intel v: 26.2.5
device-ID: 8086:3e9b surfaces: N/A device: 1 type: discrete-gpu
name: Quadro RTX 4000 driver: nvidia v: 595.104.02 device-ID: 10de:1eb6
surfaces: N/A device: 2 type: cpu name: llvmpipe (LLVM 23.1.3 256 bits)
driver: mesa llvmpipe v: 26.2.5 (LLVM 23.1.3) device-ID: 10005:0000
surfaces: N/A
Info: Tools: api: clinfo, eglinfo, glxinfo, vulkaninfo
de: kscreen-console,kscreen-doctor gpu: nvidia-settings,nvidia-smi
wl: wayland-info x11: xdpyinfo, xprop, xrandr
The external monitor is driven by the Nvidia card. Please upgrade to snapshot 20261024 (there is a new Nvidia driver) and report back.
[And please use “pre-formatted text”, use the </> button above the editing area, when pasting terminal output here ]
And https://bugs.kde.org/show_bug.cgi?id=527526 might also be relevant with your configuration.
Thanks 
Just made the upgrade 20261024 but the problem still exist with the new nVidia driver.
The bug you mentionned is very relevant, thank you. Not sure yet I will do the workaroud, which is quite complex and must probably be undone before next update. Maybe I will wait for the next update…
Have a nice day !
Got the same problem. Followed the guide at this Garuda Linux forum to solve it.
https://forum.garudalinux.org/t/workaround-kwin-6-8-1-flickering-black-windows-on-a-monitor-connected-to-the-nvidia-gpu-intel-nvidia/49246
Seems to have fixed the external monitor flashing. According to this forum, there is a fix in Plasma 6.8.1 that fixes this permenantly.
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