[plasmashell] [Bug 483163] On X11 with compositing turned on, blank screen on lock screen when using Breeze Plasma style

[bugzilla_noreply at kde.org]

https://bugs.kde.org/show_bug.cgi?id=483163

vestige at sdf.org changed:

           What    |Removed                     |Added
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                 CC|                            |vestige at sdf.org

--- Comment #47 from vestige at sdf.org ---
Hello,
I have this issue as well, on compiled-from-source kscreenlock 6.1.2 compiled
via Arch's PKGBUILD, on an Intel system running hybrid NVIDIA graphics. Same
symptoms as discussed previously:

- Black screen with a cursor that does not change after locking manually or
after timeout
- Normal expected behavior from kscreenlock_greet --testing even in Breeze
Plasma Style
- Switching to a virtual console and back returns the UI
- Entering the unlock password results in an unlock, even with no visible
widgets
- No error messages in logs
- Using a Plasma Style other than Breeze works

Also, running in an environment where QT_LOGGING_RULES is set:

> export QT_LOGGING_RULES="qt.qpa.*.debug=true"

results in the expected behavior with a visible lock screen - I was attempting
to collect Qt logs with and without a broken lock screen. Enabling logging for
qt.scenegraph.* (or anything else at that level I've tried so far) does not
"fix" the issue. Maybe this is a race condition after all.

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