Comment # 6 on bug 83226 from Alex Deucher

(In reply to Andy Furniss from comment #5)
> I see these are in your tree now - a question: what does tvrgb do?
> 
> By which I mean does it just "tell" the TV via hdmi info that the signal is
> limited or does it do more eg. scale so it really is limited between 16 &
> 235?

The latter.