(In reply to philipmorant from comment #4)
> I understand if AMD object to coding for something that hasn't been
> validated (I'd do the same myself).  Would it be possible alternatively to
> provide hints in log output or code comments or on a wiki somewhere, such
> that people in my position can hack the source themselves ?

The easiest way to hack this is probably to double TMDS_MAX_PIXEL_CLOCK in
amd/display/include/signal_types.h from 165000 to 330000.