https://bugs.kde.org/show_bug.cgi?id=504655
Bug ID: 504655
Summary: Severe input latency and limited refresh rate option
on resolutions other than the native one on kwin
wayland
Classification: Plasma
Product: kwin
Version First 6.3.5
Reported In:
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: major
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: q1253328...@163.com
Target Milestone: ---
On kwin_wayland if I choose any resolution other than the native resolution (
which is 2560x1600 ), there will be two problems: noticeable input lag and the
refresh rate limited 60Hz.
While other setups:
1. on kde plasma on X.org, the refresh rate problem presists, but there's no
extra input latency
2. on gnome wayland or windows 11, with resolutions set to below 1600p, there's
no extra input latency and i can have 240Hz refresh rate.
Note that on these two platforms there's no 1 second of black screen when
changing mode, so i guess that on these two platforms the monitor mode is not
changed but mutter (or dwm.exe on windows? i guess) adapts the chosen mode to
monitor's native mode. I would love plasma to have an option that it has the
same behavior, sometimes i need to lower the resolution to get better
performance on some fullscreen games.
Based on the behavior of kde plasma on X mode, I guess that the refresh rate is
because of how my monitor reports EDID. But since the input latency problem is
unique to kde plasma on wayland, so i guess it's a bug of kwin_wayland.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch linux
KDE Plasma Version: 6.3.5
KDE Frameworks Version: 6.14.0
Qt Version: 6.9.0
Graphics Processor 1: Intel® Graphics
Graphics Processor 2: NVIDIA GeForce RTX 4060 Laptop GPU
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