Bug 403421

Summary:	some QT based application don't show anything but plain color in their window
Product:	[Plasma] kwin	Reporter:	Edward Torvalds <wg51rrr1>
Component:	general	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED WORKSFORME
Severity:	normal
Priority:	NOR
Version:	5.14.5
Target Milestone:	---
Platform:	Manjaro
OS:	Linux
Latest Commit:		Version Fixed In:
Sentry Crash Report:

Description Edward Torvalds 2019-01-20 08:46:32 UTC

SUMMARY
After some time of usage, some QT based applications like qTox, qBittorrent go completely empty, they don't show their window but a single colour. This does not happen on first launch but after some time of usage.  
I am not a developer so please help me out if I am missing some information. Thanks

STEPS TO REPRODUCE
1. Launch qTox, qBittorrent
2. (use for some time)
3. (window goes total blank)

OBSERVED RESULT
Application window goes blank

EXPECTED RESULT
Should see the content of window and should be able to interact.

SOFTWARE/OS VERSIONS
Windows: (no)
MacOS: (no)
Linux/KDE Plasma: Manjaro KDE edition (latest version -- updated my system before filing the bug)
(available in About System)
KDE Plasma Version: 5.14.5
KDE Frameworks Version: 5.53.0
Qt Version: 5.12.0

ADDITIONAL INFORMATION
screen shot of About system: https://i.imgur.com/FaYs7OB.png  
screen shot of blank window of qTox: https://i.imgur.com/9IsIeAg.png  
Page of above screen shots: https://imgur.com/a/qmiTW4N  

Thanks

Comment 1 Christoph Feck 2019-02-15 01:37:26 UTC

Does changing compositor options make a difference? Use "kcmshell5 kwincompositing".

Comment 2 Edward Torvalds 2019-02-17 08:55:57 UTC

(In reply to Christoph Feck from comment #1)
> Does changing compositor options make a difference? Use "kcmshell5
> kwincompositing".

currently my compositor is using opengl 3.1 and vsync set to automatic. I tried changing these settings but did not help (while the window was blank)

Comment 3 Edward Torvalds 2019-02-17 08:57:24 UTC

(In reply to Christoph Feck from comment #1)
> Does changing compositor options make a difference? Use "kcmshell5
> kwincompositing".

launching the application _after_ changing compositor to use opengl 2 also did not help

Comment 4 Martin Flöser 2019-07-13 16:08:23 UTC

Please provide the output of qdbus org.kde.KWin /KWin supportInformation

Please also attach screenshots to the bug report instead of link to external page.

Comment 5 Vlad Zahorodnii 2023-01-18 12:43:19 UTC

5.14 is quite old. If the issue is still present, reopen the bug report and provide the requested info.