https://bugs.kde.org/show_bug.cgi?id=501329
Bug ID: 501329
Summary: When width of surface multipled by fractional scaling
value is a certain value, fonts are blurry in kitty
Classification: Plasma
Product: kwin
Version: 6.3.2
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: core
Assignee: kwin-bugs-n...@kde.org
Reporter: kel...@kelvie.ca
Target Milestone: ---
SUMMARY
I reported this to kitty, and the developer there said this is likely a
compositor issue. I can help fix this if someone can point me to the right
direction (I've contributed a bugfix to kwin a long time ago in the past!)
https://github.com/kovidgoyal/kitty/issues/8429
STEPS TO REPRODUCE
1. Set fractional scaling to 1.25x (e.g. using kscreen-doctor
output.DP-1.scale."1.25" )
2. Resize the window so that the surface width, when multipled by the scaling
factor, ends up .00, .50, or 0.75
3. notice the blurry fonts
This is all in the github bug above, with screenshots and logs. I also put some
debug statements in kwin (I think I have the right spot), and as far as I can
tell, kwin and kitty both agree on the pixel-perfect size of the buffer.
As a workaround, I've been setting the screen scale to 1.26 (which actually
gets set as 1.2583333333333333), presumably so it's a lot less likely to run
into whatever rounding error is causing this.
OBSERVED RESULT
Blurry fonts
EXPECTED RESULT
Not blurry fonts
SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 6.3.2
KDE Frameworks Version: 6.11.0
Qt Version: 6.8.2
Kernel Version: 6.13.5-arch1-1 (64-bit)
Graphics Platform: Wayland
Processors: 32 × AMD Ryzen 9 5950X 16-Core Processor
Memory: 62.7 GiB of RAM
Graphics Processor: NVIDIA GeForce RTX 4090
ADDITIONAL INFORMATION
See the bug in: https://github.com/kovidgoyal/kitty/issues/8429
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