Constant high CPU load after (dis)connecting an external display

[galiovsky]

Environment

Windows build number: 10.0.22000.282
Your Distribution version: not distro specific (reproduced both on Fedora 34 and Ubuntu 20.04)
Your WSLg version: 1.0.26 (the issue has been hitting me on previous versions too)

Ryzen 4650U with integrated graphics. Issue persists across multiple driver versions.
Both screens 1920x1080, one scaled at 100 %, the other 125 %, vertically arranged.

Steps to reproduce

1. Run a distro, can be freshly booted. No need to run any apps.
2. While the distro is running, connect an external display. (Or if you have one attached already, disconnect it.)

WSL logs:

• weston.log
• versions.txt
• wsl.etl.zip

Expected behavior

Nothing unusual happens.

Actual behavior

Vmmem starts to load one CPU core 100% constantly until Ctrl+Shift+Win+B is pressed or WSL is shut down altogether.

For more reports, see microsoft/WSL#6982.

[hideyukn88]

@galiovsky, thanks for trying out WSLg, It looks your versions.txt shows you are on WSLg ( x86_64 ): 1.0.24, which is very old version, would you please update to the latest version? You can install from https://github.com/microsoft/wslg/releases, or even better, install from Store, please refer https://devblogs.microsoft.com/commandline/a-preview-of-wsl-in-the-microsoft-store-is-now-available/. Thanks!

[hideyukn88]

@galiovsky, here is a bit more additional info, you might be hitting the issue fixed by microsoft/weston-mirror#24, which is not in WSLg 1.0.24. Thanks!

[galiovsky]

@hideyukn88 wow, I didn't know there's a WSL preview available. wsl --update told me I'm on the latest version... Installed the WSL Preview from the Store and indeed it looks like the issue is solved! Will test this some more and reopen later if needed... Thank you!

edit: Just pasting the issue-free versions for reference...

WSLg ( x86_64 ): 1.0.29+Branch.main.Sha.2e87e194b507f0ced0b08f715096a35cf9f51498
Mariner: VERSION="1.0.20210224"
FreeRDP: b05321cd4e6a862aef76163a69db4e1910245736
weston: b49e1942ac6242c9dd2118fbd7072e1692f49208
pulseaudio: 2f0f0b8c3872780f15e275fc12899f4564f01bd5