https://bugs.kde.org/show_bug.cgi?id=494473
Bug ID: 494473
Summary: Black Screen on login to Wayland session when HDR left
on NVIDIA Driver 555 and 560
Classification: Plasma
Product: kwin
Version: unspecified
Platform: Ubuntu
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: david_oldf...@hotmail.com
Target Milestone: ---
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SUMMARY
I have an NVIDIA RTX 3090 and I just upgraded to Kubuntu 24.10 and tried HDR.
Cycling HDR works fine while logged in but if I leave HDR on SDDM works fine
but logging into a plasma wayland session causes my monitors to go black with
no mouse cursor. Sounds happen if I plug or unplug devices leading me to
believe the DE is still running but there is no display. Ctrl+Alt+F5 or similar
does not work to give me a terminal. If I login through SSH I can restart SDDM
using systemctl and SDDM will work properly (ie graphics capabilities
restored,) but the logging into a plasma session will cause the issue to
repeat. I originally fixed the issue by rolling back to nvidia-driver-550
turning off hdr and then reinstalling nvidia-driver-560. I also tried
nvidia-driver-555 in the course of my troubleshooting and it seems to function
identically to nvidia-driver-560 ie the problem exists and rolling from 555 to
560 or 560 to 555 doesn't help.
STEPS TO REPRODUCE
1. install Kubuntu 24.10 using nvidia-driver-560 or 555 using an nvidia
graphics card
2. log into a plasma session and enable hdr on all monitors
3. restart the machine and try to log back in (I have not tested but assume
logging out and logging back in would do the same)
OBSERVED RESULT
plasma session appears to be running but no graphical output is available and
virtual terminals cannot be accessed with Ctrl+Alt+Fkey shortcuts.
EXPECTED RESULT
plasma session works normally and hdr is on.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Kubuntu 24.10
KDE Plasma Version: 6.1.5
KDE Frameworks Version: 6.6.0
Qt Version: 6.6.2
ADDITIONAL INFORMATION
I created a shell script so I can restore an image without switching drivers (I
couldn't find a config file to change?,) by sshing in from another machine.
#!/bin/env bash
WAYLAND_DISPLAY=wayland-0 #this will likely work for any normal desktop user
might have to confirm the
#environment variable in a working login session
kscreen-doctor output.DP-1.hdr.disable #I have two displayport monitors
connected need to confirm monitor names
#in a working environment using "kscreen-doctor -o"
kscreen-doctor output.DP-2.hdr.disable
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