https://bugs.kde.org/show_bug.cgi?id=428499
Bug ID: 428499
Summary: Frame callbacks not send on 'empty' commits
Product: kwin
Version: unspecified
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: platform-drm
Assignee: kwin-bugs-n...@kde.org
Reporter: robert.ma...@posteo.de
Target Milestone: ---
SUMMARY
The Firefox Wayland backend uses a rather unconventional but, according to spec
and with a clear consensus of Weston, Gnome and wlroots devs, valid method to
use frame callbacks: it tries to emulate vsync by constantly requesting frame
callbacks in a dedicated loop for the main surface - even though it may not
trigger any repaints (i.e. doesn't attach new buffers nor submits any damage).
KWin currently gets stuck when this happens (as did other compositors until
they got fixed :) )
STEPS TO REPRODUCE
1. start Firefox (preferably >=83) with the Wayland backend enabled
(`MOZ_ENABLE_WAYLAND=1`)
2. enable `widget.wayland_vsync.enabled` (and preferably `gfx.webrender.all`)
in `about:config`
3. restart the browser
OBSERVED RESULT
Firefox does not update its content
EXPECTED RESULT
Firefox should work pretty much as normal
SOFTWARE/OS VERSIONS
KDE Plasma Version: has been confirmed for up to 5.20
ADDITIONAL INFORMATION
Firefox bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1616894
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