https://bugs.kde.org/show_bug.cgi?id=485884
Bug ID: 485884
Summary: With an offscreen effect enabled, opening a window
without frame sometimes causes a flickering black
screen on Wayland
Classification: Plasma
Product: kwin
Version: 6.0.4
Platform: NixOS
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: effects-various
Assignee: kwin-bugs-n...@kde.org
Reporter: afd5997d-00de-465b-bd93-7f979e280...@simplelogin.com
Target Milestone: ---
Created attachment 168736
--> https://bugs.kde.org/attachment.cgi?id=168736&action=edit
The output of "qdbus org.kde.KWin /KWin org.kde.KWin.supportInformation"
SUMMARY
When window decorations are disabled, a window's expanded geometry can be 0 for
a very short period of time after being opened. Frame geometry seems to always
have a correct value.
When an offscreen effect is active, KWin attempts to allocate a 0 by 0 texture
in OffscreenData::maybeRender, which fails, but KWin uses that texture anyways.
This results in the entire screen turning black with the following messages
being logged in the journal:
kwi 21 10:35:49 thinkpad kwin_wayland[1628]: kf.windowsystem: static bool
KX11Extras::mapViewport() may only be used on X11
kwi 21 10:35:49 thinkpad kwin_wayland[1628]: kwin_scene_opengl: 0x2:
GL_INVALID_VALUE in glTexStorage2D(width, height or depth < 1)
kwi 21 10:35:49 thinkpad kwin_wayland[1628]: kwin_scene_opengl: Invalid
framebuffer status: "GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT"
kwi 21 10:35:49 thinkpad kwin_wayland[1628]: kwin_scene_opengl: Can't enable
invalid framebuffer object!
This issue only occurs on Wayland. I found two programs it can reliably
reproduced with:
- Cryptomator (1.12.4)
- GIMP (2.10.36)
It doesn't seem to occur with Qt or other GTK applications.
STEPS TO REPRODUCE
1. Create a window rule that disables the titlebar and frame
2. Enable an offscreen effect, such as colorblindness correction
3. Open GIMP (sometimes this alone can cause the bug)
4. Repeatedly open and close a dialog by pressing CTRL+N and ESC. If the issue
does not occur after a few attempts, restart GIMP and try again.
OBSERVED RESULT
The entire screen turns black and flickers until repainted.
EXPECTED RESULT
The screen shouldn't turn black.
SOFTWARE/OS VERSIONS
Linux: NixOS 24.05, Linux 6.8.7
KDE Plasma Version: 6.0.4
KDE Frameworks Version: 6.1.0
Qt Version: 6.7.0
ADDITIONAL INFORMATION
I've attached videos of the issue occurring with GIMP and Cryptomator along
with the output of "qdbus org.kde.KWin /KWin org.kde.KWin.supportInformation".
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