https://bugs.kde.org/show_bug.cgi?id=489798
Bug ID: 489798
Summary: After system update, SteamVR is very stuttery / laggy
/ dropping frames due to "Display Error"
Classification: Plasma
Product: kwin
Version: 6.1.2
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: kwin-bugs-n...@kde.org
Reporter: joni.hil...@yahoo.de
Target Milestone: ---
Created attachment 171410
--> https://bugs.kde.org/attachment.cgi?id=171410&action=edit
Screenshot of SteamVR performance graph after update with "Display Error"
purple lines
SUMMARY
After I did a "pacman -Syu" System upgrade I tried playing SteamVR but it's
suddenly extremely laggy / stuttery and therefore unplayable.
The lag can only be experienced in the VR headset (I'm using Valve Index)
The VR game view on the desktop looks fine without any stuttering.
The purple lines in the performance graph in the SteamVR box (see screenshot)
mean "Display Error".
There was no lag and no purple lines before the update (see other screenshot)
I don't know if this is a KDE issue, but I have ruled out kernel and nvidia
driver (by updating them separately beforehand and checking it still works) so
far and I don't know what else could have caused this.
It was a pretty big list of updates (few hundreds of packages - I will send it
as soon as I can)
I can rollback my system to the state before the update where it still works
without issues.
The issue happens on X11 and Wayland
STEPS TO REPRODUCE
1. Try using SteamVR with up-to-date KDE
2. Experience lag in VR headset (any game as well as SteamVR Home)
OBSERVED RESULT
Extreme lag in the VR headset
EXPECTED RESULT
Smooth gameplay like before the update
SOFTWARE/OS VERSIONS
Not working version:
Operating System: Arch Linux
KDE Plasma Version: 6.1.2
KDE Frameworks Version: 6.3.0
Qt Version: 6.7.2
Kernel Version: 6.9.7-3-cachyos-lto (64-bit)
Graphics Platform: Wayland
Processors: 24 × 13th Gen Intel® Core™ i7-13700K
Memory: 62.5 GiB of RAM
Graphics Processor: NVIDIA GeForce RTX 3090 Ti/PCIe/SSE2
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