https://bugs.kde.org/show_bug.cgi?id=485170

            Bug ID: 485170
           Summary: Plasma 6 often (but not always) fails to launch when
                    using proprietary Nvidia drivers
    Classification: Plasma
           Product: kwin
           Version: unspecified
          Platform: Other
                OS: Other
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: wayland-generic
          Assignee: kwin-bugs-n...@kde.org
          Reporter: k...@ajhall.us
  Target Milestone: ---

Created attachment 168235
  --> https://bugs.kde.org/attachment.cgi?id=168235&action=edit
Logs from failed login

SUMMARY
Sometimes when I boot my computer and try to log in to KDE Plasma via SDDM, I
get a black screen for about 10 seconds and then get kicked back to SDDM. I can
try logging in again, but the behavior is the same.

There seems to be roughly a 50% chance of this happening on each boot -
sometimes a reboot will fix it and I can log in normally, while other times I
have to reboot several times before I get lucky enough to log in.

If I re-enable Nouveau I can usually get to a desktop consistently, but
unfortunately I can't stick with Nouveau drivers because they leave one of my
two monitors blank. I otherwise haven't had any noticeable issues with the
Nvidia drivers.

This leads me to believe that the problem is something with the interaction
between the Nvidia drivers and Plasma, but I don't know how to narrow it down.
Let me know which logs would be the most helpful to collect.

STEPS TO REPRODUCE
1. Boot my computer
2. Type my password into SDDM and press enter

OBSERVED RESULT
The screen goes black for about 10 seconds, then I see SDDM again. I can try
logging in again, but the behavior is the same until I reboot.

EXPECTED RESULT
KDE Plasma desktop should launch.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Fedora 40 KDE spin
KDE Plasma Version: 6
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION
- Fedora 40 KDE spin
- Clean install (did not upgrade from Fedora 39)
- KDE Plasma 6 desktop (Wayland)
- Nvidia GeForce GTX 1070
- Nvidia driver nvidia-kmod-550.67-1.fc40.src.rpm from rpmfusion-nonfree
- Fractional scaling on one monitor (100% on left monitor, 125% on right
monitor)

I also experienced this problem with the Fedora 40 branch of Kinoite. I assumed
it was a Kinoite issue and installed the standard KDE spin, but had the same
problem.

I didn't have this issue with Fedora 39.

I also reported this on the Red Hat Bugzilla:
https://bugzilla.redhat.com/show_bug.cgi?id=2272429

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