https://bugs.kde.org/show_bug.cgi?id=357728
Bug ID: 357728
Summary: Dragging window leads to display freeze
Product: kwin
Version: 5.5.2
Platform: Exherbo Packages
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: general
Assignee: kwin-bugs-n...@kde.org
Reporter: li...@bernd-steinhauser.de
Now I am aware, that this is possibly a bug in the display driver that is
triggered by kwin.
If this is the case, what I'm here hoping for is to gather relevant information
if anything.
The bug occurs randomly (but still relatively often), when I try to drag a
window from one screen to another.
(I'm not sure if this is bound to multiscreen, since I rarely try to drag
windows around on a single screen. Haven't seen that at least.)
This can lead to the whole desktop freezing. This seems to be a complete lockup
of the gpu, I can't get back to the console even after using sysrq + r.
sysrq itself is still working as shown by the output. I can sync and reboot the
system.
Sound will continue to play and the kernel does not spit out a bug info (so it
doesn't indicate that there is something wrong).
I've not seen this happening for any trigger other than dragging a window. I
tried with and without the transparency effect.
I've also tried OpenGL 3.1 and 2.0, I've tried GLX and EGL. I think (but I'm
not sure here), I've even tried with the compositor switched off.
I've seen this issue since the update from 5.4.x to 5.5.0. A kernel update was
not performed before that started to happen (kernel 4.3. I'm now using 4.4-rc8,
but that does not affect this.).
mesa was 11.0.4 when updating kde and was updated up to 11.1.0 since.
I've since basically stopped using the dragging windows feature and just move
windows around by using the "Move to Screen" functionality and this works fine.
Only if I forget about this issue and drag a window anyway, I'm in real danger
to lock up my system (as happened yesterday again).
Reproducible: Sometimes
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