Awesome stuff! I'm running KDE as well - can't wait for Plasma 6 to start hitting the repos to get HDR on CP2077.

I have an even newer GPU so a more current kernel was needed. I went with testing because I prefer to follow a more up-to-date system, and it's almost as solid as stable so I don't see many downsides. I wouldn't do it on a server but on the desktop I can easily work around or fix whatever minor nags appear.

I really wanted to get Mesa from experimental though as it follows upstream pretty closely (just a few days lag usually), and testing being generally closer to it probably helps. Or not, I haven't really tested that assumption. :D