I tried a few things so not sure if this was the exact fix but I removed VaapiDriver=“i965” from Preferences.xml and got HW working again. I don’t think it’s needed anymore (I added it a while ago for my DS920).
i have a DS220+ and I just realized Im also having issues with hw transcoding no longer working, Im running plex on docker with latest image and after reading the info on this thread I tried downgrading my plex to 1.29.2.6364 however i havent been successful as after downgrading and starting plex I keep getting some errors on the log (attached image)
I also tried removing VaapiDriver=“i965” from Preferences.xml with no success.