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#1 2022-03-18 09:07:21

tomz12
Member
Registered: 2019-08-02
Posts: 24

Closed: Standard monitor resolution "disappeared" over night

I shut down my laptop yesterday (after the updating) and when starting up this morning in my docking station my main monitor won't go to full resolution any longer.
My standard resolution for years has been 2560x1440, now I am only offered 1920x1080.

xrandr, nVidia Settings, KDE Display Configuration will all show 1920x1080 as maximum resolution.
I did check my notes from back when I installed, and can see that all 3 should show 2560x1440 as an option.

Journalctl shows the following error for BumbleeD, starting today:

    Mär 18 09:37:53 hermes bumblebeed[699]: [   56.749870] [WARN][XORG] (WW) NVIDIA(0): No valid modes for "DFP-4:2560x1440"; removing.
    Mär 18 09:37:53 hermes bumblebeed[699]: [   56.749882] [WARN][XORG] (WW) NVIDIA(0):
    Mär 18 09:37:53 hermes bumblebeed[699]: [   56.749893] [WARN][XORG] (WW) NVIDIA(0): Unable to validate any modes; falling back to the default mode
    Mär 18 09:37:53 hermes bumblebeed[699]: [   56.749905] [WARN][XORG] (WW) NVIDIA(0):     "nvidia-auto-select".

When setting things up I had to manually add the resolution to the file below, it's still unchanged:

cat /etc/bumblebee/xorg.conf.nvidia
Section "ServerLayout"
    Identifier  "Layout0"
    Option      "AutoAddDevices" "true"
    Option      "AutoAddGPU" "false"
EndSection

Section "Device"
    Identifier  "DiscreteNvidia"
    Driver      "nvidia"
    VendorName  "NVIDIA Corporation"
    BusID "PCI:01:00:0"
    Option "ProbeAllGpus" "false"
    Option "NoLogo" "true"
EndSection

Section "Screen"
    Identifier "Screen0"
    Device "DiscreteNVidia"
    SubSection "Display" 
       Modes       "2560x1440" 
    EndSubSection 
EndSection

I tried to add the resolution manually:

gtf 2560 1440 60
xrandr --newmode "2560x1440_60.00"  311.83  2560 2744 3024 3488  1440 1441 1444 1490  -HSync +Vsync
xrandr --addmode VIRTUAL6 "2560x1440_60.00"

...after which 2560x1440 shows as available in KDE Screen Settings, but when I set it I run into a core dump,

Process 1221 (kscreen_backend) of user 1000 dumped core.

System freezes for a while with lots of journalctl output and then comes back with the wrong resolution

And then finally I was checking if there's an obvious candidate in any of the latest updates. Well, there were a few bbswitch-dkms updates, along with the respective kernel, but as far as I know these are just recompilations rather than actual changes to the code.
I did try to boot into the LTS kernel as well, didn't make a difference.

Anyone got any other ideas as to what to check? My eyes are bleeding already :-)

Update: This seems to have resolved itself over the weekend. I hope it stays like this.

Last edited by tomz12 (2022-03-21 12:32:07)

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