WSL2 and WSLg preventing Windows 11 from sleeping
I recently experienced an issue where a freshly installed Windows 11 system was not going to sleep. It was a very similar set up in terms of software to my previous Windows 10 machine which did not seem to have any issues.
Searching online I found https://thegeekpage.com/fix-windows-10-sleep-mode-not-working-solved/ which led me to the extremely useful powercfg -requests command. Using this I noticed a WSL entry for msrdc.exe. I guessed that this must have had something to do with Microsoft Remote Desktop connection - but from Linux.
Armed with this I was able to find https://github.com/microsoft/wslg/issues/380 whose title of "Displays do not go to sleep when WSLg is enabled" summed up my problem.
As I did not need WSLg support in WSL2 I followed https://github.com/microsoft/wslg/issues/380#issuecomment-939187821 to disabled it. A reboot later and all sleep issues were resolved. Hopefully the original issue is resolved before I would like to use GUI applications in WSL2.