Bug 513838 - kwin failed to atomic modeset
Summary: kwin failed to atomic modeset
Status: REPORTED
Alias: None
Product: kwin
Classification: Plasma
Component: general (other bugs)
Version First Reported In: 6.5.4
Platform: Other Linux
: NOR normal
Target Milestone: ---
Assignee: KWin default assignee
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2025-12-26 13:02 UTC by Lemma
Modified: 2026-01-08 18:38 UTC (History)
1 user (show)

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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?