https://bugs.kde.org/show_bug.cgi?id=516369
Bug ID: 516369
Summary: Laptop monitor does not automatically activate after
removal of external monitor (after sleep)
Classification: Plasma
Product: kwin
Version First 6.4.5
Reported In:
Platform: Kubuntu
OS: Linux
Status: REPORTED
Severity: major
Priority: NOR
Component: xwayland
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
***
Following sleep (s2idle) of laptop while connected to dock/external monitor -
resume does not activate the laptop monitor.
No key combinations or further sleep/resume cycle will recover the monitor -
but plugging external monitor back in reactivates both panels.
***
SUMMARY
STEPS TO REPRODUCE
1. Connect external monitor
2. Enter sleep
3. Disconnect external monitor and open lid
OBSERVED RESULT
Not everytime - but there will be no output on laptop screen. Many messages
seen in /var/log/syslog
EXPECTED RESULT
Laptop monitor will power on
SOFTWARE/OS VERSIONS
Operating System: Kubuntu 25.10
KDE Plasma Version: 6.4.5
KDE Frameworks Version: 6.17.0
Qt Version: 6.9.2
Kernel Version: 6.17.0-12-generic (64-bit)
Graphics Platform: Wayland
Processors: 8 × Intel® Core™ Ultra 5 226V
Memory: 16 GiB of RAM (15.2 GiB usable)
Graphics Processor: Intel® Graphics
ADDITIONAL INFORMATION
These messages are seen filling /var/log/syslog
2026-02-19T19:34:14.618548+00:00 pdlap kwin_wayland_wrapper[2668]:
kwin_wayland_drm: Atomic modeset test failed! Invalid argument
2026-02-19T19:34:14.618662+00:00 pdlap kwin_wayland_wrapper[2668]:
kwin_wayland_drm: Setting dpms mode failed!
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