[kde] [Bug 482940] New: Nvidia + additional monitor immediately crashes kwin_wayland

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https://bugs.kde.org/show_bug.cgi?id=482940

            Bug ID: 482940
           Summary: Nvidia + additional monitor immediately crashes
                    kwin_wayland
    Classification: I don't know
           Product: kde
           Version: unspecified
          Platform: Neon
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: myristica at incode-labs.com
  Target Milestone: ---

Created attachment 166751
  --> https://bugs.kde.org/attachment.cgi?id=166751&action=edit
Syslog of crash after login when monitor is connected from boot

SUMMARY

Upon having a monitor connected under Wayland and Nvidia proprietary, wayland
and/or kwin_wayland immediately crashes.

Having the monitor disconnected allows normal login and usage. GPU can be used
as normal.

Having the monitor connected, even if it is disabled through KDE settings,
immedietely crashes and sends me back to the login screen. Disconnecting the
monitor allows logging back in without issue. Disconnecting the monitor during
the crash allows plasma to recover, probably from the retries.

Suspending to ram, connecting the monitor, and waking the computer back up does
not have any effect, nor is the monitor recognised as being plugged in.

This monitor works on other computers. I have tried HDMI and HDMI over USB-C,
both with the same result.

Modeset DRM and FBDev are turned on in grub kernel parameters. I have also
attempted these tests with FBDev off and both off. I have also attempted
renaming the kwin settings folder to force a re-generation.

To my knowledge, this did not occur under Plasma 5

This crash does not occur on Nouveau drivers, nor on X11.

Attached are two sets of logs, one with the monitor connected from boot and
logging in, and the other plugging in the monitor after boot and login. Crash
dumps are included within. Debug symbols are being an absolute pain to install,
and are right now not included. I will continue attempting to get a proper
backtrace and will update this post.

STEPS TO REPRODUCE
1. Plug in an external monitor
2. Log into Plasma using wayland
3. (optionally, plug in the monitor here instead)

OBSERVED RESULT
kwin_wayland crashes and user is sent back to the login screen

EXPECTED RESULT
Plasma recognises a monitor is connected and displays an image.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: KDE Neon 6.0
(available in About System)
KDE Plasma Version: 6.0.0
KDE Frameworks Version: 6.0.0
Qt Version: 6.0.2
Kernel Version: 6.5.0-25-generic (64-bit)
Nvidia Drivers: 550.54.14 (using an RTX 2070)
Computer name: ROG Strix G731GW_G731GW

ADDITIONAL INFORMATION
These bugs are possibly related: 478700, 477738, 481986

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