I did create a Tuxedo's WebFAI USB stick but it hung during boot - possibly there is a crucial difference in configuration between the Fusion Studio and the InfinityBook which Tuxedo haven't tested.
Disabling PSR with i915.enable_psr=0 worked like a charm though, thank you! I now have it...
Not yet here - I'm still looking. I've verified that the same problem exists in stock Ubuntu 21.10.
One thing I know is that Tuxedo Computers sell the identical chassis with a choice of Tuxedo OS or Ubuntu, so it must be possible. I'm going to try Tuxedo's WebFAI installer next and see if that...
Same issue here (14" Fusion Studio with Ubuntu). Safe mode works but screen brightness is non-adjustable (it seems to be at maximum, which is very bright indoors). I see the same start up error too.