[Nouveau] [Bug 109558] New: Plasma locks up after splash screen

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109558

            Bug ID: 109558
           Summary: Plasma locks up after splash screen
           Product: Mesa
           Version: 18.3
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: Drivers/DRI/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: qjztreez at outlook.com
        QA Contact: nouveau at lists.freedesktop.org

Created attachment 143306
  --> https://bugs.freedesktop.org/attachment.cgi?id=143306&action=edit
Output of dmesg

Operating System: Arch Linux 
KDE Plasma Version: 5.14.5
Qt Version: 5.12.1
KDE Frameworks Version: 5.54.0
Kernel Version: 4.20.6-arch1-1-ARCH
Graphics Card: NVIDIA GeForce GT 650M

Plasma locks up after splash screen, and it is sometimes (but not always)
possible to switch to tty2 and kill the session using loginctl. The magic SysRq
keys Alt+SysRq+REISUB and Alt+SysRq+REISUO always work though.

This seems to be a problem related to acceleration because adding the
'nouveau.noaccel=1' kernel parameter solves the problem, but disables some
desktop effects as well.

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