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Thread: Login panel doesn't appear

  1. #1

    Default Login panel doesn't appear

    After successful and uneventful logins through yesterday (Friday, Nov. 6th), this morning the machine (with all updates installed) hangs when the login dialogue would normally appear. It appeared once when I selected recovery mode for the current kernel version, but I was unable to boot in again after turning the machine off.

    The only thing I saw in boot log (journatctl -b) was a failure to find a USB external drive, but that line has a nowait option in fstab. I swapped in another drive with the
    same label, but it still doesn't present the login panel.

    Edit: Now after initially posting the message, I rebooted normally, but avoided pressing F2 to watch the boot sequence. And, inexpicably, it booted up! I've got an intermittent fault (I think), but I have no idea how to proceed.

    Any thoughts?

  2. #2
    Join Date
    Nov 2020
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    Default Re: Login panel doesn't appear

    Quote Originally Posted by w2tq View Post
    After successful and uneventful logins through yesterday (Friday, Nov. 6th), this morning the machine (with all updates installed) hangs when the login dialogue would normally appear. It appeared once when I selected recovery mode for the current kernel version, but I was unable to boot in again after turning the machine off.

    The only thing I saw in boot log (journatctl -b) was a failure to find a USB external drive, but that line has a nowait option in fstab. I swapped in another drive with the
    same label, but it still doesn't present the login panel.

    Since the machine won't boot that's all the information I have at the moment.

    Any thoughts?
    try adding nomodeset (after the quiet option in GRUB_CMDLINE_LINUX_DEFAULT) in the grub menu

  3. #3

    Default Re: Login panel doesn't appear

    Cama -

    Thank you for your reply. Briefly, how will the nomodeset grub option help? Is it a display issue? And why all of a sudden after months of uneventful logins?

    I'm now working from the workstation in question and am looking at logs, but nothing stands out.

  4. #4
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    Default Re: Login panel doesn't appear

    Quote Originally Posted by w2tq View Post
    Cama -

    Thank you for your reply. Briefly, how will the nomodeset grub option help? Is it a display issue? And why all of a sudden after months of uneventful logins?

    I'm now working from the workstation in question and am looking at logs, but nothing stands out.
    maybe you updated some drivers and they stopped working. this is what to me happened once
    nomodeset

    The newest kernels have moved the video mode setting into the kernel. So all the programming of the hardware specific clock rates and registers on the video card happen in the kernel rather than in the X driver when the X server starts.. This makes it possible to have high resolution nice looking splash (boot) screens and flicker free transitions from boot splash to login screen. Unfortunately, on some cards this doesnt work properly and you end up with a black screen. Adding the nomodeset parameter instructs the kernel to not load video drivers and use BIOS modes instead until X is loaded.

  5. #5
    Join Date
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    Default Re: Login panel doesn't appear

    The question is, did the OP update the system in between or not? That is not clear from his first post (at least not to me).

    Only guessing and then giving advice based on that guess will not help much.
    Henk van Velden

  6. #6

    Default Re: Login panel doesn't appear

    Henk -

    Your response popped up while I was writing the following response to Cama. Perhaps it answers your question about updates (only via YaSt - nothing else).

    As noted in my original post, it worked fine until yesterday. Here are the items installed via YaST yesterday:
    Code:
    # rpm -qa --last | less
    
    xscreensaver-lang-5.44-lp151.5.3.1.noarch     Fri Nov  6 06:46:05 2020
    chromium-86.0.4240.183-lp151.2.150.1.x86_64   Fri Nov  6 06:46:04 2020
    xorg-x11-Xvnc-module-1.9.0-lp151.4.9.1.x86_64 Fri Nov  6 06:45:52 2020
    xscreensaver-5.44-lp151.5.3.1.x86_64          Fri Nov  6 06:45:51 2020
    libtiff5-4.0.9-lp151.10.3.1.x86_64            Fri Nov  6 06:45:51 2020
    libminizip1-1.2.11-lp151.5.12.1.x86_64        Fri Nov  6 06:45:51 2020
    tigervnc-1.9.0-lp151.4.9.1.x86_64             Fri Nov  6 06:45:50 2020
    zlib-devel-1.2.11-lp151.5.12.1.x86_64         Fri Nov  6 06:45:48 2020
    xorg-x11-Xvnc-1.9.0-lp151.4.9.1.x86_64        Fri Nov  6 06:45:48 2020
    xscreensaver-data-5.44-lp151.5.3.1.x86_64     Fri Nov  6 06:45:47 2020
    libz1-1.2.11-lp151.5.12.1.x86_64              Fri Nov  6 06:45:47 2020
    libXvnc1-1.9.0-lp151.4.9.1.x86_64             Fri Nov  6 06:45:47 2020
    I note that several packages related to xorg-x11-Xvnc were installed, but it is not clear that this could be the culprit. An opensuse forum search and a Google search for the package didn't yield any relevant items.

    Please again note that the only apparent symptom is the non-appearance of the login dialog.

  7. #7
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    Default Re: Login panel doesn't appear

    Quote Originally Posted by cama View Post
    Adding the nomodeset parameter instructs the kernel to not load video drivers and use BIOS modes instead until X is loaded.
    That's wrong. All high competence FOSS X drivers (amdgpu, intel, modesetting, nouveau, radeon) are prevented from loading by disabling KMS (e.g. via nomodeset), explained here. Nomodeset results in slow, unresponsive, lowfi X from use of fallback drivers FBDEV or VESA, if any X at all. Some DEs will not start at all if KMS is disabled.

    Nomodeset can facilitate some configuration adjustments, if any manual ones are indicated, but it definitely won't be part of OP's ultimate solution, unless OP is using a non-FOSS driver (e.g. some versions of NVidia's proprietary drivers) that explicitly requires KMS be disabled.

    What OP should do is hit ESC as soon as a Grub selection has been made in hopes of noticing an error message pointing to a problem.

    Sometimes the problem is only in the GUI bling that precedes the login manager. Striking the E key at the Grub menu will enable the string plymouth=0 to be appended to the line that begins linu before proceeding with boot. This for one boot only will turn off the bling, which may work around the problem. If it does, for a longer term solution either Plymouth may be uninstalled using zypper or YaST, or plymouth=0 can be included in the GRUB_CMDLINE_LINUX_DEFAULT= line in /etc/default/grub followed by regenerating grub.cfg using grub2-mkconfig -o /boot/grub2/grub.cfg.

    OP should upload /var/log/Xorg.0.log.old or ~/.local/share/xorg/Xorg.0.log.old, whichever is newer if both exist, on a nomodeset or failsafe boot immediately following a normal boot attempt, using the susepaste command or by visiting https://susepaste.org or https://pastebin.com. Output from:
    Code:
    sudo journalctl -b -1 | susepaste
    or
    Code:
    sudo journalctl -b -1 > sometextfile.txt
    and uploading to susepaste.org or pastebin.com. The URLs from the uploads should be pasted here for our examination.

    It may be helpful to also include output pasted here using code tags surrounding the paste from the following run from an X terminal:
    Code:
    inxi -SMGIay
    If this produces an error message, try omitting the y. It can be run from a vtty shell prompt, but less information will result.
    Last edited by hcvv; 07-Nov-2020 at 14:38. Reason: repaired code tag
    Reg. Linux User #211409 *** multibooting since 1992
    Primary: 15.1, TW, 15.2 & 13.1 on Haswell w/ RAID
    Secondary: eComStation (OS/2)&15.1 on i965P/Radeon
    Tertiary: TW,15.2,15.1,Fedora,Debian,more on Kaby Lake,iQ45,iQ43,iG41,iG3X,i965G,AMD,NVidia&&&

  8. #8
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    Default Re: Login panel doesn't appear

    Quote Originally Posted by w2tq View Post
    After successful and uneventful logins through yesterday (Friday, Nov. 6th), this morning the machine (with all updates installed) hangs when the login dialogue would normally appear. It appeared once when I selected recovery mode for the current kernel version, but I was unable to boot in again after turning the machine off.

    The only thing I saw in boot log (journatctl -b) was a failure to find a USB external drive, but that line has a nowait option in fstab. I swapped in another drive with the
    same label, but it still doesn't present the login panel.

    Edit: Now after initially posting the message, I rebooted normally, but avoided pressing F2 to watch the boot sequence. And, inexpicably, it booted up! I've got an intermittent fault (I think), but I have no idea how to proceed.

    Any thoughts?
    In the grub boot option
    If you go to advanced options
    Do you have older kernels?
    Have you tried those
    Tumbleweed_KDE
    My Articles Was I any help? If yes: Click the star below

  9. #9

    Default Re: Login panel doesn't appear

    Here is the response:
    Code:
    linux-5:~ # inxi -SMGIa
    System:    Host: linux-5.fios-router.home Kernel: 4.12.14-lp151.28.75-default x86_64 bits: 64 compiler: gcc v: 7.5.0 
               parameters: BOOT_IMAGE=/boot/vmlinuz-4.12.14-lp151.28.75-default root=UUID=82c65205-7768-4135-8ef0-eb131bfbfcaf 
               splash=silent resume=/dev/disk/by-uuid/9db42ad9-6172-42c9-b322-c01ce43e8048 mitigations=auto quiet 
               Console: tty 1 wm: kwin_x11 dm: SDDM Distro: openSUSE Leap 15.1 
    Machine:   Type: Desktop Mobo: ASUSTeK model: P6X58-E-WS v: Rev 1.xx serial: 109358920000181 BIOS: American Megatrends v: 0301 
               date: 02/22/2011 
    Graphics:  Device-1: NVIDIA GF106 [GeForce GTS 450] vendor: eVga.com. driver: nouveau v: kernel bus ID: 07:00.0 
               chip ID: 10de:0dc4 
               Display: server: X.Org 1.20.3 compositor: kwin_x11 driver: nouveau unloaded: fbdev,modesetting,vesa 
               alternate: nv,nvidia display ID: :0 screens: 1 
               Screen-1: 0 s-res: 3840x1200 s-dpi: 96 s-size: 1016x317mm (40.0x12.5") s-diag: 1064mm (41.9") 
               Monitor-1: DVI-I-1 res: 1920x1200 hz: 60 dpi: 94 size: 518x324mm (20.4x12.8") diag: 611mm (24.1") 
               Monitor-2: DVI-I-2 res: 1920x1200 hz: 60 dpi: 94 size: 518x324mm (20.4x12.8") diag: 611mm (24.1") 
               OpenGL: renderer: NVC3 v: 4.3 Mesa 18.3.2 direct render: Yes 
    Info:      Processes: 263 Uptime: 2h 15m Memory: 11.71 GiB used: 5.89 GiB (50.3%) Init: systemd v: 234 runlevel: 5 
               target: graphical.target Compilers: gcc: 7.5.0 alt: 7 Shell: bash (su) v: 4.4.23 running in: konsole inxi: 3.1.00 
    linux-5:~ #
    This may not be of interest until I get the next failure, but the current Xorg and old Xorg logs may be seen here: current log https://susepaste.org/54295229 and old log https://susepaste.org/17692425

    In response to caf4926, yes I have the previous version, gnulinux-4.12.14-lp151.28.71 (grub.cfg). Both the default and the recovery options failed (no login screen visible).

  10. #10

    Default Re: Login panel doesn't appear

    In looking over my notes and files, I see that I have the following logs from this morning when the problem occurred. The files were compiled before the second successful boot in the afternoon.

    I recognize that some of this may be duplicative, but include links to all of the files I created this morning.

    boot.log https://susepaste.org/1435409

    dump of journalctl: https://susepaste.org/66753647

    warn log: https://susepaste.org/17146095

    messages: https://susepaste.org/39413208

    journtalctl-boot 110720: https://susepaste.org/93748811

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