Bug 513838

Summary: kwin failed to atomic modeset
Product: [Plasma] kwin Reporter: Lemma <speedlemma>
Component: generalAssignee: KWin default assignee <kwin-bugs-null>
Status: REPORTED ---    
Severity: normal CC: nate
Priority: NOR    
Version First Reported In: 6.5.4   
Target Milestone: ---   
Platform: Other   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description Lemma 2025-12-26 13:02:37 UTC 
kwin_wayland_wrapper[1606]: No backend specified, automatically choosing drm
Dec 20 15:59:18 404-UU kwin_wayland_wrapper[1606]: kwin_core: EDID colorimetry xy(0, 0) xy(0, 0) xy(0, 0) xy(0, 0) is invalid
kwin_wayland_drm: atomic commit failed: Permission denied
Dec 20 15:59:22 404-UU kwin_wayland_wrapper[1606]: kwin_wayland_drm: Atomic modeset test failed! Permission denied

kwin show error and monitor goes black after boot, while gnome can handle this easily.

Gnome-shell[6153]: Added device '/dev/dri/card1' (i915) using atomic mode setting

does kwin support fallback mode?