https://bugs.kde.org/show_bug.cgi?id=477917
Bug ID: 477917
Summary: Strange adaptive sync behaviour on Plasma 6 Beta 1
Classification: Plasma
Product: kwin
Version: 5.90.0
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: woutertje...@gmail.com
Target Milestone: ---
SUMMARY
After updating to Plasma 6 beta 1 there has been some weird Adaptive Sync
behaviour for me (on wayland). I could consistently reproduce this by launching
games likes Sea of Thieves through steam. I didn't experience this issue in
5.27.9. When Adaptive Sync is set to automatic it won't activate and when set
to always cursor movement doesn't impact refresh rate.
STEPS TO REPRODUCE
- Mouse problem:
1. Set Adaptive Sync to always
2. Set monitor refreshrate higher than 60hz
- Adaptive Sync Automatic problem:
1. Set Adaptive Sync to automatic.
2. Set monitor refreshrate higher than 60hz
2. Launch a game (with proton?)
3. Monitor will still be locked to max refresh rate.
OBSERVED RESULT
When playing most games Adaptive Sync will not activate on some games.
Furthermore after launching a game that doesn't behave correctly (such as Sea
of Thieves) games that did behave correctly (Quake II RTX) will also not work
anymore and will also be locked to max refresh. The only ways I could find to
get games that behaved correctly working again is to reboot or set Adaptive
Sync to always. When Adaptive Sync is set to always, however, cursor movement
doesn't impact refresh rate resulting in a sluggish desktop experience.
EXPECTED RESULT
On plasma stable if Adaptive Sync is set to automatic it will almost always
lock refresh rate to game frame rate, unless you move your cursor, then refresh
rate would lock to max refresh. This is ideal behaviour in my opinion.
SOFTWARE/OS VERSIONS
- Plasma 5 Stable (correct behaviour):
KDE Plasma Version: 5.27.9
KDE Frameworks Version: 5.112.0
Qt Version: 5.15.11
Kernel: 6.6.3-zen
- Plasma 6 Beta (incorrect behaviour):
KDE Plasma Version: 5.90.0
KDE Frameworks Version: 5.264.0
Qt Version: 6.6.1
Kernel: 6.6.3-zen
ADDITIONAL INFORMATION
I am using AMDGPU (RX 7900 XTX) with Mesa 23.2.1 and Proton-experimental on
steam.
I measured the refresh rate using the refresh rate overlay of my monitor (Acer
X27P).
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