https://bugs.kde.org/show_bug.cgi?id=392169
Bug ID: 392169
Summary: Flickering and degraded performance with redshift
enabled
Product: plasmashell
Version: 5.12.3
Platform: Other
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: general
Assignee: k...@davidedmundson.co.uk
Reporter: rokups...@gmail.com
CC: plasma-b...@kde.org
Target Milestone: 1.0
As of 5.12 upgrade having redshift enabled causes screen flickering at some
interval. As if redshift would get disabled for split second and get reenabled
again. This also appears to cause performance issues for 3D applications.
Consider following snippet:
```
SDL_Event evt;
while (SDL_PollEvent(&evt))
HandleSDLEvent(&evt);
```
At some interval (like 5 seconds or so) SDL_PollEvent takes over 40ms to return
on my machine. Then application processes SDL_WINDOWEVENT_FOCUS_GAINED and
SDL_WINDOWEVENT_TAKE_FOCUS events.
Also at seemingly regular but longer intervals there is a notable slowdown when
3D application is clearing screen (see code in question:
https://github.com/urho3d/Urho3D/blob/master/Source/Urho3D/Graphics/OpenGL/OGLGraphics.cpp#L662-L712
).
All mentioned problems go away when redshift is disabled.
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