https://bugs.kde.org/show_bug.cgi?id=481125
Bug ID: 481125
Summary: Screen resolution gains additional 1px on wayland with
fractional scaling
Classification: Plasma
Product: kwin
Version: 5.27.8
Platform: Kubuntu
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: insa...@protonmail.com
Target Milestone: ---
SUMMARY
Screen resolution gains additional 1px on wayland with fractional scaling.
STEPS TO REPRODUCE
1. Log in with wayland session, 100% scaling. Verify that your screen
resolution matches what's in Settings with `xrandr` (in my case 2560 x 1440)
2. Set 150% scaling. Again, verify your resolution to be identical with what's
in settings with `xrandr` (still 2560 x 1440 for me)
3. Restart the machine or the session
OBSERVED RESULT
Settings will still show original resolution (2560 x 1440 in my case) while in
fact it gained +1px horizontally which can be verified with `xrandr` that shows
2561 x 1440.
EXPECTED RESULT
Resolution should stay the same regardless of scaling.
SOFTWARE/OS VERSIONS
Distro: Kubuntu 23.10
KDE Plasma Version: 5.27.8
KDE Frameworks Version: 5.110.0
Qt Version: 5.15.10
Session: Wayland
ADDITIONAL INFORMATION
I also tried this with my second screen which is 2560 x 1600 and it got +1px
both horizontally and vertically after restart. This is also quiet pronounced
with gaming both natively and on proton - everything becomes blurry and the
game sees this "extended" resolution along with the original one. Selecting
either of those results in blur btw. Running the game when xrandr reports
proper resolution results in crisp, pixel-perfect experience.
There's a temporary solution - switch to 100% scale and then back to 150% and
DON'T restart. It'll keep original resolution and it works fine.
I also tried this with different fractional scaling like 120%, 140%, 170% and
the result is the same. Unsurprisingly, scaling factors like 200% and 300% work
fine.
I'm not sure but this issue may be as well related to these:
https://bugs.kde.org/show_bug.cgi?id=459373
https://bugs.kde.org/show_bug.cgi?id=475612
https://bugs.kde.org/show_bug.cgi?id=480171
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