https://bugs.kde.org/show_bug.cgi?id=528166
Bug ID: 528166
Summary: Mouse click/drag stutter on mixed refresh rate setup
(144Hz + 60Hz) under Wayland (specifically in World of
Warcraft)
Classification: Plasma
Product: kwin
Version First 6.8.2
Reported In:
Platform: CachyOS
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: compositing
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Hi everyone,
Summary:
Micro-stutters and frame-pacing hiccups occur when pressing, holding, or
releasing mouse buttons (left/right click) on a multi-monitor Wayland setup
with fractional refresh rate ratios.
System Environment:
OS: CachyOS (KDE Plasma 6.8.2, Wayland)
GPU: AMD Radeon RX 9070 XT
Displays:
Primary: 2560x1440 @ 144Hz (ASUS VG27AQL1A)
Secondary: 1920x1080 @ 60Hz (Lenovo T24m-29)
Detailed Description:
The bug is especially noticeable in World of Warcraft (WoW), where camera
control relies heavily on holding down the left or right mouse button to steer
or pan. The moment a mouse button is pressed or released, a brief lag/stutter
spike occurs. This issue likely affects other games utilizing hold-and-drag
camera mechanics or frequent cursor state changes.
Steps Taken & Diagnostics:
Enabled FreeSync/Adaptive-Sync in monitor OSD and set KDE Display Settings to
Automatic — Issue persisted.
Lowered main monitor refresh rate from 144Hz down to 120Hz — This completely
eliminated the click/drag lag.
Observed Behavior:
Running a fractional/non-integer refresh rate ratio (144Hz / 60Hz = 2.4:1)
causes KWin's event/render loop or hardware cursor plane updates to desync upon
mouse state transitions. Lowering the primary display to 120Hz creates an exact
2:1 integer ratio (120Hz / 60Hz), which runs completely smooth.
Expected Behavior:
Mouse click and drag inputs should process smoothly at 144Hz without requiring
an integer refresh rate ratio relative to the secondary 60Hz display.
Thank you,
Patrick
--
You are receiving this mail because:
You are watching all bug changes.
