https://bugs.kde.org/show_bug.cgi?id=478333
Bug ID: 478333
Summary: Random stutters while gaming on Wayland session.
Classification: Plasma
Product: kwin
Version: 5.27.9
Platform: Flatpak
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: siamlig...@protonmail.com
Target Milestone: ---
STEPS TO REPRODUCE
1. Boot up a game (from my experience, Monster Hunter Rise on Steam, Monster
Hunter Generations Ultimate on Ryujinx).
2. Proceed through the main menus, load up a heavy area in Rise, such as the
beginning forest area, traverse around. For Gens U, the main hub seems to be
enough.
OBSERVED RESULT
Both games stutter, and the stutters don't seem either GPU or CPU related.
While the GPU is maxed out on Rise, it stays that way through the whole run and
only stutters randomly rather than all the time. The footage for Gens U on
Ryujinx is a bit blurry, but the CPU and GPU usage don't reach past 75%.
I should note that when I'm not recording, Rise stutters only while in
Fullscreen/Borderless Fullscreen. The stutters are alleviated on Windowed mode.
For Generations Ultimate, on the other hand, the reverse seems to be true.
Having the emulator windowed will cause the game to stutter, but enabling
Fullscreen removes all the stuttering.
Video for reference: https://streamable.com/ih8mie
It should be noted that I haven't been able to reproduce this problem inside an
X11 session.
EXPECTED RESULT
No stutter. I have tried Windows, and Rise doesn't stutter there at all, other
than the first run shader compilations.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Fedora Kinoite
KDE Plasma Version: 5.27.9
KDE Frameworks Version: 5.111.0
Qt Version: 5.15.11
ADDITIONAL INFORMATION
A while ago, I opened a similar ticket on the GNOME Mutter bug tracker. With
GNOME, the stutters were more severe as they affected the whole desktop rather
than just the game window. However, MH Rise didn't stutter there, and in
Plasma, FFXIV doesn't seem to stutter like it did for me in GNOME. That post
might have more insight on the issue, so I'll link it here as well for
reference. https://gitlab.gnome.org/GNOME/mutter/-/issues/3121
I'm beginning to suspect it might be a driver issue, but I can't be sure about
it. I know Raven Ridge doesn't have the best Linux support, and I'm using a
2200G APU with integrated Vega 8 graphics. No overclocking on my system other
than the RAM's XMP profile.
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