https://bugs.kde.org/show_bug.cgi?id=509603
Bug ID: 509603
Summary: On Wayland, Variable Refresh Rate should never affect
the speed of the mouse cursor
Classification: Plasma
Product: kwin
Version First unspecified
Reported In:
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: performance
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
When using variable refresh rate, especially when set to "always" in display
settings, the mouse cursor never affects the display refresh rate (the refresh
rate respects the content, never the mouse itself moving) so the mouse will
stutter A LOT when changing FPS levels. For example, when we watch a 30 fps
video on fullscreen, the whole KDE UI and the mouse will be at 30 fps too and
its extremely annoying. This also affects games when games have low fps the
mouse gets considerably more stuttery.
The fix should probably be the mouse and the whole KDE Plasma animations also
count towards the variable refresh rate movement response, so on a 120Hz
screen, watching 30 fps content or opening any plasma panel or menu, the plasma
animations should trigger the VRR to go to max (120Hz) while the animation
happens, or when moving the mouse around. Overall user inputs like mouse
movement or keyboard typing should trigger VRR to jump to max Hz so the mouse
movements and plasma animations stay smooth, and keyboard keeps feeling
responsive.
VRR set to "always" is a pretty cool idea to save energy on laptops similar to
what adaptive refresh rates to on mobile phones or even newer "Pro Motion"
macbooks.
GNOME just kinda fixed this, maybe we could do the same on KDE:
https://www.techpowerup.com/340107/gnome-49-gets-fix-for-laggy-cursors-with-vrr-enabled-shortly-ahead-of-release
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