(In reply to Andy Furniss from comment #2)

> Maybe some pot luck is involved, maybe there is more than one issue - all
> the goods during the bisect were just tested once with boot from TV off.

Early testing - alternate booting a 10 times between "bad" kernel and a kernel
on the commit before  shows it's not pot luck. The kernel "before" always works
and the one on the commit I bisected as bad always fails (TV off at boot) until
it gets a prod via xrandr.

Seems almost anything will do, though just xrandr alone won't but any of

off then auto
--set audio on
--set dither on
--mode 0x..

will get sound back.

Also reconfirmed that the above tricks do not work on head.