https://bugs.kde.org/show_bug.cgi?id=487037
Bug ID: 487037
Summary: kwin software cursor fallback locks up entire screen
under certain conditions
Classification: Plasma
Product: kwin
Version: 6.0.4
Platform: Gentoo Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: platform-drm
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
SUMMARY
kwin is able to fall back to a software cursor if its cursor plane operation is
rejected by the KMS driver's atomic plane check. This works fine in most
circumstances, however locks up the entire screen surface when the rejected
swap occurs over the windows of certain applications. This is most apparent
with Firefox, VLC, LibreOffice or GIMP on Apple Silicon Macs with hardware
plane support implemented.
This does not occur with Plasma panels or most KDE apps (tested with
Konversation, System Settings, etc).
STEPS TO REPRODUCE
1. Use an Apple Silicon Mac
2. Observe that when moving the cursor to the bottom or right edge of the
screen, kwin correctly picks up that the KMS driver has rejected the swap and
falls back to software cursors.
3. Open one of Firefox, VLC, LibreOffice or GIMP
4. Make sure one of the application's windows clips the bottom or right edge of
the screen
5. Move the cursor to the edge of the screen clipped by the window
OBSERVED RESULT
Kwin considers the entire screen state to be rejected and locks up all planes
until the cursor is moved away from the edge of the screen, at which point
things work properly again.
EXPECTED RESULT
kwin should fall back to software cursors consistently
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Linux 6.8.9-asahi-5 (with hardware plane patches)
KDE Plasma Version: 6.0.4
KDE Frameworks Version: 6.1.0
Qt Version: 6.7.0
ADDITIONAL INFORMATION
The patched KMS driver can be found at
https://github.com/chadmed/linux/tree/dcp-overlay-planes
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