https://bugs.kde.org/show_bug.cgi?id=434511
Bug ID: 434511
Summary: Cannot set scaling factor of 1.333… (3 to 4 scaling)
using kscreen-doctor
Product: KScreen
Version: 5.21.2
Platform: Debian unstable
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: common
Assignee: kscreen-bugs-n...@kde.org
Reporter: alexander-kde@ninetailed.ninja
Target Milestone: ---
STEPS TO REPRODUCE
1. Run `kscreen-doctor output."<FHD Screen
Name>".{mode.1920x1080@60,scale.1.3333333333333333}` on a full-hd (1920x1080)
screen
OBSERVED RESULT
Reported screen geometry will be “1441x811” pixels at scale factor “1.33203”
EXPECTED RESULT
Screen geometry should be “1440x810” pixels at scale factor “1.33333” (or
reasonably close, at least 3 digits are required for it to round the geometry
values correctly)
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Debian unstable with Plasma 5.21 from experimental
KDE Plasma Version: 5.21.2 (Wayland)
KDE Frameworks Version: 5.79.0
Qt Version: 5.15.2
ADDITIONAL INFORMATION
I like this particular value since for my particular setup (about 1,2m distance
to 16,4" screen) using 125%, or god forbid the original 100%, is somewhat too
small while 150% reduces the usable screen estate too much.
While I'm mostly happy with the way things are, the bad rounding of the scale
factor mean that I get 1dpx wide “magic bar” next to the right border of the
physical screen that regularily changes its image between what appears to be
different contents of uninitialized video memory. It's not overly annoying and
I've gotten used to it, but it'd be great if it could disappear.
I've also noticed that `xrandr` instead reports a screen geometry of
`1440x811`, so that may have something to do with the “magic bar”.
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