https://bugs.kde.org/show_bug.cgi?id=386752
Bug ID: 386752
Summary: Black textures after toggling compositing on/off
Product: kwin
Version: unspecified
Platform: Kubuntu Packages
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: compositing
Assignee: kwin-bugs-n...@kde.org
Reporter: andy...@mail.ru
Target Milestone: ---
Created attachment 108798
--> https://bugs.kde.org/attachment.cgi?id=108798&action=edit
Firefox window is black in the background
If I toggle kwin compositing off and on again via hotkey, I'm beginning to see
black textures in the GUI. Initially, I can see some windows blink to black
briefly when I open, maximize or increase the size of other windows. For
example, I have a maximized Firefox window and I start KCalc; when KCalc window
appears Firefox window blinks black for like a frame or two and then back to
normal.
If you keep using the system in such state the problem seems to progress
because occasionally some windows or their regions remain black after the
animation. I've attached a screenshot of one occurrence of the problem. In the
background there's maximized Firefox. In the front there is Kate window, which
I've just resized (increased the size) with mouse and Firefox turned black and
stayed that way until I took the screenshot (the screenshot utility opened a
window, which restored Firefox). The problem seems to happen with different
applications, Qt and not.
This bug may be related to https://bugs.kde.org/show_bug.cgi?id=354731 (it may
be the easy way to reproduce that issue).
I'm using Kubuntu 17.10, x86_64, Nvidia 387.22, X.org server 1.19.5, kwin
5.10.5. The problem also appeared on Kubuntu 17.04 and maybe earlier with older
versions of drivers and kwin.
/etc/environment contains:
KWIN_TRIPLE_BUFFER=1
KWIN_USE_BUFFER_AGE=0
__GL_SYNC_TO_VBLANK=1
__GL_SYNC_DISPLAY_DEVICE="DFP-0"
__GL_THREADED_OPTIMIZATIONS=1
Kwin is started with this command line:
__GL_THREADED_OPTIMIZATIONS=0 kwin_x11
(Note: __GL_THREADED_OPTIMIZATIONS have no effect on the problem; I disable it
for kwin because this way it consumes less CPU.)
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