https://bugs.kde.org/show_bug.cgi?id=525829
Bug ID: 525829
Summary: kwin_wayland: "Atomic modeset test failed! Invalid
argument" on DPMS wake after screen lock (Intel iGPU),
desktop temporarily loses all outputs
Classification: Plasma
Product: kwin
Version First 6.6.6
Reported In:
Platform: Gentoo Packages
OS: Linux
Status: REPORTED
Severity: major
Priority: NOR
Component: core
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
SUMMARY
After locking the session and letting the display go into DPMS
standby (actual monitor sleep, not just the lock screen appearing),
waking it via keyboard input intermittently triggers a KWin DRM
atomic modeset failure. This causes all outputs to briefly
disappear; in some occurrences plasmashell crashes and is
auto-restarted by its crash handler, in other occurrences KWin and
plasmashell recover in place without a process restart. The panel
and desktop background are affected; other already-open application
windows continue running underneath.
STEPS TO REPRODUCE
1. Log into a Plasma Wayland session (manual TTY login running
`dbus-run-session startplasma-wayland`, no display manager)
2. Lock the session (`loginctl lock-session` or the usual shortcut)
3. Wait long enough for the monitor to actually go to sleep (DPMS
off) - not just the lock screen showing
4. Wake the display via keyboard input and unlock
OBSERVED RESULT
Intermittently (not on every cycle), the panel and desktop
background disappear for a few seconds. journalctl/session log
shows:
kwin_wayland_drm: Atomic modeset test failed! Invalid argument
qt.qpa.wayland: There are no outputs - creating placeholder screen
Key repeat discarded, Wayland compositor doesn't seem to be
processing events fast enough!
In more severe occurrences, plasmashell dies outright and is
auto-restarted (new PID, KSplash reappears), preceded by:
kwin_core: could not find the toplevel to activate
KWin::SurfaceInterface(0x...)
kde.plasmashell: requesting unexisting screen available rect -1
EXPECTED RESULT
Waking the display after DPMS sleep and unlocking should reliably
restore panel/desktop/outputs without any visible outage or process
crash.
SOFTWARE/HARDWARE VERSIONS
KWin Version: 6.6.6 (Gentoo ebuild)
Kernel: 6.18.48-gentoo-dist-bin
GPU: Intel Corporation TigerLake-LP GT2 [Iris Xe Graphics] [8086:9a49] (rev 01)
Distribution: Gentoo
Display manager: none (manual TTY login, dbus-run-session
startplasma-wayland)
Kernel cmdline includes: i915.enable_psr=0
ADDITIONAL INFORMATION
- Panel Self Refresh (PSR) has been ruled out as the cause: the
eDP panel does not support PSR/Panel Replay in hardware at all
(/sys/kernel/debug/dri/0000:00:02.0/eDP-1/i915_psr_status reports
"Sink support: PSR = no, Panel Replay = no"), and disabling PSR
via i915.enable_psr=0 did not prevent the issue.
- The issue only reproduces when the display physically enters DPMS
standby; a quick lock/unlock cycle where the display never sleeps
does not trigger it.
- Behavior is intermittent/race-condition-like rather than 100%
reproducible on every DPMS wake cycle.
- Worked around locally with a polling watchdog
(pgrep -x plasmashell, restart on death) as plasmashell crashes
are not always self-recovering.
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