This bug was fixed in the package kwin - 4:6.6.3-0ubuntu3
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kwin (4:6.6.3-0ubuntu3) resolute; urgency=medium
* Add fix-drm-open-fallback-to-logind-fd.patch: Fall back to logind
file descriptor when direct DRM node open fails. Fixes SDDM greeter
compositor failing to start after logout because sddm user lacks
filesystem-level permissions on /dev/dri/card* during session switch.
(LP: #2147233)
-- Erich Eickmeyer <[email protected]> Fri, 03 Apr 2026 14:40:00
-0700
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https://bugs.launchpad.net/bugs/2147233
Title:
sddm and kwin have race condition with logout
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