@mms @brnrd ok, I performed some tests:
Ethernet works
The video card seems to be working with the latest drm but produces lots of glitches and video playback of 4K contents generates a lot of cpu load and lost frames
The media keys seem to be working out of the box but I can't hear any audio (probably something to tweak)
Suspending works, but can't resume (it seems the video driver doesn't like it)
It's definitely better than the last time I tried, but it doesn't look stable, yet