My understanding was "removing DRI1 drivers", which basically means "removing unmaintained drivers", most of which happened to be UMS because that was state of the art last time those drivers *were* maintained.
Agree that it wouldn't take a *lot* of maintenance, but the ones removed were the ones where after multiple requests for maintainers to step up nobody had responded.
Yeah, the removal was in Mesa AFAIK, which basically removed the 3D hardware accel component that worked with older UMS drivers from the ongoing Mesa tree. The UMS drivers themselves wouldn't necessarily have been affected.
I imagine there will be a corresponding cleanup in the DRM as well (or maybe it's already happened) but most of the UMS drivers I have seen will still come up and run without DRM support being present.
Interestingly, they work better with gnome-shell than 12.2 and very surprising to me - they work flawlessly with my bitcoin miner, which wasn't starting at all with anything newer than 11.12. Well done, AMD!
Now, how can I remove that "AMD testing use only" from the lower right corner?
Mint 12, HD6950