Bug 358963 - compositor often needs restart to stop flickering
Summary: compositor often needs restart to stop flickering
Status: RESOLVED DUPLICATE of bug 358646
Alias: None
Product: kwin
Classification: Plasma
Component: general (show other bugs)
Version: 5.4.2
Platform: Kubuntu Linux
: NOR normal
Target Milestone: ---
Assignee: KWin default assignee
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2016-02-03 20:24 UTC by cf
Modified: 2016-02-05 12:31 UTC (History)
0 users

See Also:
Latest Commit:
Version Fixed In:
Sentry Crash Report:

Attachments
qdbus org.kde.KWin /KWin supportInformation (5.41 KB, text/plain)
2016-02-04 08:40 UTC, cf 		Details
View All Add an attachment

Note You need to log in before you can comment on or make changes to this bug.
Description cf 2016-02-03 20:24:19 UTC 
I have flickering windows. i find setting compositor to "full screen repaint" fixes it. 

Flickering returns every reboot. I go back to compositor settings, choose  something else, then go back to "full screen repaint" and it is OK again.

Reproducible: Always




OpenGL version string:                  3.0 Mesa 11.0.2
OpenGL version:                         3.0
GLSL version:                           1.30
Mesa version:                           11.0.2
X server version:                       1.17.2
Linux kernel version:                   4.2

Qt: 5.4.2
KDE Frameworks: 5.15.0
Comment 1 Thomas Lübking 2016-02-04 00:35:47 UTC 
sounds more like restarting the compositor "fixes" it, try SHIFT+Alt+F12 twice instead.
Also attach the output of "qdbus org.kde.KWin /KWin supportInformation"
Comment 2 cf 2016-02-04 08:38:48 UTC 
I put all compositor settings back to defaults. i was about to write how the problem had gone, then 10 min after login it came back. "SHIFT+Alt+F12 twice" fixed it (temporarily, I guess). At least I have an efficient workaround.

I renamed this report.
Comment 3 cf 2016-02-04 08:40:13 UTC 
Created attachment 97002 [details]
qdbus org.kde.KWin /KWin supportInformation
Comment 4 Thomas Lübking 2016-02-04 17:17:08 UTC 
bug #358646 ?!
see https://bugs.kde.org/show_bug.cgi?id=358646#c1 for a likely workaround
Comment 5 cf 2016-02-04 20:10:33 UTC 
I created kwin_env.sh as described and rebooted. i still had the flickering. 

I did 'echo $KWIN_TRIPLE_BUFFER', to check if I had done everything correctly. It did not return '1' , so perhaps I messed up, though i cannot see where.
Comment 6 Thomas Lübking 2016-02-04 21:26:25 UTC 
forgot to chmod +x the file?

For a quick test just run

    KWIN_TRIPLE_BUFFER=1 kwin_x11 --replace &

Should survive as many compositor restarts as you push on it.
Comment 7 cf 2016-02-04 21:33:49 UTC 
I made it executable. 

my ~/.xsession-errors did not mention triple buffering, so i thought that was not the problem.

I have run the line you suggested. i will report back if it fixes the problem when it manifests.
Comment 8 Thomas Lübking 2016-02-04 22:19:27 UTC 
Reg environment you may suffer from bug #352491 ?
Comment 9 cf 2016-02-05 12:28:29 UTC 
    KWIN_TRIPLE_BUFFER=1 kwin_x11 --replace &

fixes it. I guess it restarts the compositor and more. So the question is does it stay fixed after that is run.
Comment 10 Thomas Lübking 2016-02-05 12:31:55 UTC 
It restarts entire KWin, incl. the compositor, but keeping the environment set should downforce the issue.

Pre-emptively marking as dupe. If you see the problem despite the triple buffer path enforced, please re-open it.

*** This bug has been marked as a duplicate of bug 358646 ***