https://bugs.kde.org/show_bug.cgi?id=433484
Bug ID: 433484
Summary: OpenGL-related Qt-based software does not work
properly
Product: neon
Version: unspecified
Platform: Neon Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Packages User Edition
Assignee: neon-b...@kde.org
Reporter: geisse...@gmail.com
CC: j...@jriddell.org, neon-b...@kde.org, sit...@kde.org
Target Milestone: ---
Created attachment 136081
--> https://bugs.kde.org/attachment.cgi?id=136081&action=edit
OpenGL Rendering fault with Scantailor - I can provide examples from at least 3
more apps if necessary
SUMMARY
I am experiencing numerous issues related to Qt-based software with
OpenGL(ES)-accelerated graphical interfaces.
The part of the application that should be drawn by Qt OpenGL(ES) is either
completely invisible (on Wayland, even the application or wallpaper behind is
shown), and/or severely suffering from rendering artifacts / flickering.
Some affected/tested applications:
- Gwenview (activate OpenGL in settings) [neon package]
- OBS Studio [neon package]
- ScanTailor Advanced (activate OpenGL in settings) [self-built]
- Olive Video Editor 0.1 branch [ubuntu package]
- Olive Video Editor 0.2 branch [self-built]
The enormous similarity of the issues, affecting both official builds from neon
and self-built applications, makes me think that this problem may likely be
caused by malconfigured Qt OpenGL(ES) packages in KDE Neon. It is rather
unplausible that these problems are caused by my setup or configuration since
all non-Qt OpenGL-related stuff works well.
STEPS TO REPRODUCE
1. Install or build one of the applications mentioned above (or, potentially,
any application depending on libqt5gui5-gles or libqt5opengl5)
2. Open the respective application and (if necessary) activate OpenGL (there
might be a need to restart)
3. Open/load an image, video, or whatever
OBSERVED RESULT
Applications using Qt OpenGL modules do not render footage/media at all, or
only with extreme flickering and rendering artifacts.
-> On Wayland, you will see the application behind (or the desktop wallpaper)
in the frame where the footage should be rendered
-> On X11, you will see nothing (only the background colour)
EXPECTED RESULT
Content should render at all on Qt-OpenGL(ES), and without artifacts or
flickering. The stuff behind should not be visible in the content frame.
SOFTWARE/OS VERSIONS
Operating System: KDE neon 5.21
KDE Plasma Version: 5.21.0
KDE Frameworks Version: 5.79.0
Qt Version: 5.15.2
Linux Kernel Version: 5.4.0-66-generic
OS Type: 64-bit
Graphics Platform: Wayland (X11 is affected as well)
Processors: 4 × Intel® Core™ i5-3570K CPU @ 3.40GHz
Memory: 7.2 GiB of RAM
Graphics Processor: Mesa DRI Intel® HD Graphics 4000
ADDITIONAL INFORMATION
- The issue already existed in previous versions of neon (5.20)
- A possible idea is that a partial cause might be the libqt5gui5-gles package,
which is not installable as it's still the Ubuntu version (but this cannot be
the only reason, since Gwenview does not depend on this package, but is
affected too)
- I am not certain whether this is related or not, but my self-built OpenToonz
(latest stable release tarball) crashes on startup with a segmentation fault
because the EGL context could not be created (only on Wayland, though; it at
least comes up on X11)
DISCLAIMER
Although I believe these problems might be caused by neon packaging mistakes, I
am not sure; it's nothing but an assumption. I might easily be wrong (it could
even be an issue with Qt, for instance, or something hardware specific).
However, I chose to report this here because the distribution seems like the
first place to ask for help.
NOTES ON REPRODUCIBILITY
Information on whether other users can reproduce this issue or not would be
important. Reproducibility might also depend on the hardware / drivers used.
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