https://bugs.kde.org/show_bug.cgi?id=495400
Bug ID: 495400
Summary: Desktop session slows to a crawl on multi-monitor
setups while running VR
Classification: Plasma
Product: kwin
Version: 6.2.2
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: performance
Assignee: kwin-bugs-n...@kde.org
Reporter: dantheman22...@hotmail.com
Target Milestone: ---
So I have 2 1080p displays, a 1440p 360hz monitor, and a Valve Index hooked up
to my system. I had no trouble driving all of these at once since about 6.2.1,
however with a recent update, once I start up either Monado or SteamVR, it
brings my session down to its knees. My cursor remains active, but windows will
take seconds to refresh or move around.
STEPS TO REPRODUCE
1. Start Plasma Wayland
2. Have more than one monitor plugged in and a wired HMD
3. Startup SteamVR or Monado
OBSERVED RESULT
VR view remains smooth while desktop session is incredibly sluggish
EXPECTED RESULT
VR view and desktop view remain performant
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: EndeavourOS
KDE Plasma Version: 6.2.2-1
KDE Frameworks Version:
Qt Version: 6.8.0
ADDITIONAL INFORMATION
I tested on my spare Quest 2 with WiVRn and ALVR, which seemed to work fine. I
also unplugged 2 of my monitors to find the session was smooth again, so the
problem seems to be exclusive to wired HMDs on multi-monitor setups
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