https://bugs.kde.org/show_bug.cgi?id=465809
Bug ID: 465809
Summary: external display running through an egpu is very laggy
Classification: Plasma
Product: kwin
Version: unspecified
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: multi-screen
Assignee: kwin-bugs-n...@kde.org
Reporter: ro...@appus.org
Target Milestone: ---
SUMMARY
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STEPS TO REPRODUCE
1. Install Fedora 37 KDE spin
2. plug in an egpu RX 5700
3. plug in monitor into egpu
4. reboot
OBSERVED RESULT
both laptop and external display work. laptop display is buttery smooth.
external display is choppy.
EXPECTED RESULT
Both laptop and the external display work. laptop display is buttery smooth.
external display is buttery smooth
SOFTWARE/OS VERSIONS
Windows:
macOS:
Linux/KDE Fedora 37 KDE spin Plasma: 5.26.5
(available in About System)
KDE Plasma Version: 5.26.5
KDE Frameworks Version: 5.103.0
Qt Version: 5.15.8
ADDITIONAL INFORMATION
I am running wayland with a display plugged into an egpu Radeon RX5700. I
created a post with my laptop manufacturer with some additional details:
https://community.frame.work/t/linux-poor-performance-of-egpu-driven-external-monitor-in-fedora-37-kde-spin/27290
After running the following script to designate my egpu as primary per this
project:
https://github.com/ewagner12/all-ways-egpu/wiki
I now observe the external display is smooth and the integrated display is now
choppy.
My suggestion would be to either run the display on the gpu for which it is
designated and give options to switch this or provide an option within KDE to
select which GPU to use and note that the other will perform poorly
Perhaps the choppiness is also an issue with wayland or kwin that could in
itself be resolved? Being able to choose which gpu to use is still needed for
tasks like running games though
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