https://bugs.kde.org/show_bug.cgi?id=489952
Bug ID: 489952
Summary: Inconsistent frame timing of cursor on desktop
Classification: Plasma
Product: plasmashell
Version: 6.1.2
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: plasma-b...@kde.org
Reporter: pallasw...@proton.me
CC: k...@davidedmundson.co.uk
Target Milestone: 1.0
Created attachment 171487
--> https://bugs.kde.org/attachment.cgi?id=171487&action=edit
Mouse stutter on desktop
SUMMARY
if you want to see this, just take your mouse, and drag it in a line across
your display.
What you should see, courtesy of pixel response times leaving behind ghosts of
the previous frames, is a line of cursors, evenly spaced, like so:
x x x x x x x x x x x x x x x x
What you will see instead, is a broken line of cursors, like so:
x x x x x x x x x x x x x
If this isn't hanging around on screen long enough just move the mouse in
circles. Instead of seeing a nice evenly spaced 'polygon' of pointers, you'll
see them clumped together - or you'll notice the 'breaks' in the circle of
cursors. For me, the pattern I can see on screen is 3 pointers, then a gap,
like `x x x x x x x x x ` The most number of these 'breaks' we should ever
be able to see, if the cursor movement is consistently drawn, is one - after
the least recent one (in other words, at the end).
This does not occur when the cursor is above an application, or if the cursor
has been magnified by the 'shake cursor' effect, then, it is drawn with perfect
consistent timing. It does occur over the desktop, even if the same app as
mentioned is visible on that display (so, it seems the entire display is not
effected, just the mouse cursor). This does occur over panels on the desktop.
This occurs on both VRR and fixed-refresh monitors, with or without VRR
enabled.
STEPS TO REPRODUCE
1. Move mouse
OBSERVED RESULT
Stutter
EXPECTED RESULT
Smooth
SOFTWARE/OS VERSIONS
Windows:
macOS:
Linux/KDE Plasma: Tumbleweed
(available in About System)
KDE Plasma Version: 6.1.2
KDE Frameworks Version: 6.3.0
Qt Version: 6.7.2
ADDITIONAL INFORMATION
image attached shows a 120Hz monitor with the mouse being moved quickly at
consistent speed across a black desktop
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