https://bugs.kde.org/show_bug.cgi?id=487409
Bug ID: 487409
Summary: LG monitor hotplug on DPMS power on causes several
applications to resize their windows
Classification: Plasma
Product: kwin
Version: 6.0.4
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: platform-drm
Assignee: kwin-bugs-n...@kde.org
Reporter: kod...@gmail.com
Target Milestone: ---
SUMMARY
I have an LG 24UD58-B monitor (3840x2160@60Hz) and a Dell P2414H
(1920x1080@60Hz), and when the two monitors DPMS cycle off, everything is fine.
When the LG monitor powers back on, due to a bug in its deep sleep state, it
causes a DRM hotplug event, which causes only that monitor to bounce out of the
desktop layout. This causes all my windows to pop over to a desktop that's one
quarter of the size and half the scale of the primary display.
The only applications I have right now which are affected oddly by this are
Steam (XWayland) and WezTerm (Wayland). Steam shrinks so its window now fits
into the top left quarter of the screen, while WezTerm shrinks itself to the
minimum allowed window size and becomes unusable until I resize it again.
STEPS TO REPRODUCE
1. Acquire the listed monitors, any video card to drive them, but AMDGPU in
this case.
2. Allow DPMS to cycle the displays off completely.
3. Move the mouse to cycle them on.
OBSERVED RESULT
Windows move around, some of them shrink, others shrink unusably.
EXPECTED RESULT
Desktop should make an attempt to absorb the DRM event and seed a new DRM
surface handle to the compositor.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch Linux, kernel 6.9.1-2-cachyos (64-bit)
(available in About System)
KDE Plasma Version: 6.0.4
KDE Frameworks Version: 6.2.0
Qt Version: 6.7.0
ADDITIONAL INFORMATION
Bug is a minor nuisance, but at least better than whole apps crashing on
monitor hotplug like some other desktops on the machine do. It would be nice if
a slight delay could be added to actual hotplug events to coalesce a monitor
disappearing for just a moment into a DRM handle refresh.
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