when i boot my computer after having run an update, my primary monitor (which should be at 1920x1080) is stuck at 640x480. interestingly, when i reboot and change nothing, it fixes itself until i run another update.

i’m on arch, using nvidia 555.58-2, on plasma 6.1.1-1. the monitor in question is DP-0 in the system info below.

what could be causing this and how can i fix it?

i’ve been having this issue for a while while kinda just dealing with it because it was something i could easily work around by booting my computer twice, but i’d really like to get it solved.

system info:

relevant (i think) inxi output 
System:
  Host: ***** Kernel: 6.9.7-arch1-1 arch: x86_64 bits: 64
  Desktop: KDE Plasma v: 6.1.1 Distro: Arch Linux
Graphics:
  Device-1: NVIDIA GP104 [GeForce GTX 1080] driver: nvidia v: 555.58
  Device-2: EMEET HD Webcam C960 driver: snd-usb-audio,uvcvideo type: USB
  Display: x11 server: X.Org v: 21.1.13 with: Xwayland v: 24.1.0 driver: X:
    loaded: N/A failed: nvidia gpu: nvidia resolution: 1: 1920x1080
    2: 1920x1080~60Hz 3: 1920x1080~60Hz
  API: EGL v: 1.5 drivers: kms_swrast,nvidia,swrast
    platforms: gbm,x11,surfaceless,device
  API: OpenGL v: 4.6.0 compat-v: 4.5 vendor: nvidia mesa v: 555.58
    renderer: NVIDIA GeForce GTX 1080/PCIe/SSE2
  API: Vulkan v: 1.3.279 drivers: nvidia surfaces: xcb,xlib
xrandr from first boot 
Screen 0: minimum 8 x 8, current 4480 x 1080, maximum 32767 x 32767
DVI-D-0 connected 1920x1080+1920+0 (normal left inverted right x axis y axis) 509mm x 286mm
   1920x1080     60.00*+
   1680x1050     59.95  
   1440x900      59.89  
   1280x1024     60.02  
   1280x800      59.81  
   1280x720      60.00  
   1152x864      75.00  
   1024x768      70.07    60.00  
   800x600       60.32    56.25  
   640x480       59.94  
HDMI-0 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 1600mm x 900mm
   3840x2160     30.00 +  59.94    29.97    23.98  
   4096x2160     59.94    24.00  
   1920x1080     60.00*   59.94    29.97    23.98    60.00  
   1680x1050     59.95  
   1440x900      59.89  
   1280x1024     60.02  
   1280x960      60.00  
   1280x800      74.93    59.81  
   1280x768      59.87  
   1280x720      60.00    59.94    29.97    23.98  
   1024x768      60.00  
   800x600       60.32    56.25  
   720x480       59.94  
   640x480       59.94    59.93  
DP-0 connected 640x480+3840+0 (normal left inverted right x axis y axis) 0mm x 0mm
   640x480       59.94*+
DP-1 disconnected (normal left inverted right x axis y axis)
DP-2 disconnected (normal left inverted right x axis y axis)
DP-3 disconnected (normal left inverted right x axis y axis)
DP-4 disconnected (normal left inverted right x axis y axis)
DP-5 disconnected (normal left inverted right x axis y axis)
xrandr from the second boot 
Screen 0: minimum 8 x 8, current 3840 x 1080, maximum 32767 x 32767
DVI-D-0 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 509mm x 286mm
   1920x1080     60.00*+
   1680x1050     59.95  
   1440x900      59.89  
   1280x1024     60.02  
   1280x800      59.81  
   1280x720      60.00  
   1152x864      75.00  
   1024x768      70.07    60.00  
   800x600       60.32    56.25  
   640x480       59.94  
HDMI-0 connected 1920x1080+1920+0 (normal left inverted right x axis y axis) 1600mm x 900mm
   3840x2160     30.00 +  59.94    29.97    23.98  
   4096x2160     59.94    24.00  
   1920x1080     60.00*   59.94    29.97    23.98    60.00  
   1680x1050     59.95  
   1440x900      59.89  
   1280x1024     60.02  
   1280x960      60.00  
   1280x800      74.93    59.81  
   1280x768      59.87  
   1280x720      60.00    59.94    29.97    23.98  
   1024x768      60.00  
   800x600       60.32    56.25  
   720x480       59.94  
   640x480       59.94    59.93  
DP-0 connected primary 1920x1080+1920+0 (normal left inverted right x axis y axis) 531mm x 299mm
   1920x1080     60.00 + 144.00*  119.98    99.93    59.94    50.00  
   1680x1050     59.88  
   1440x900      59.90  
   1280x1024     75.02    60.02  
   1280x720      60.00    59.94    50.00  
   1024x768     119.99    99.97    75.03    70.07    60.00  
   800x600      119.97    99.66    75.00    72.19    60.32    56.25  
   720x576       50.00  
   720x480       59.94  
   640x480      119.52    99.77    75.00    72.81    59.94    59.93  
DP-1 disconnected (normal left inverted right x axis y axis)
DP-2 disconnected (normal left inverted right x axis y axis)
DP-3 disconnected (normal left inverted right x axis y axis)
DP-4 disconnected (normal left inverted right x axis y axis)
DP-5 disconnected (normal left inverted right x axis y axis)
  • businessfishOPEnglish
    4•3 days ago

    that’s worth checking - i don’t have a spare DP cable on hand to test, but you may be onto something.

    previously, i tried unplugging and replugging the cable on the PC end, as well as trying other ports, to no avail.

    just now, i tried replugging the end plugged into the monitor a few times and was able to reproduce the resolution issue a single time. this honestly just confuses me more though, because why would it happen only one time out of several cycles doing the exact same thing?

    i’m gonna get another cable just to be sure but that wont be for a few days at least.