(In reply to Andy Furniss from comment #12)
> xrandr --verbose will show you the options/output name and the current
> setting.
> 
> to change do something like -
> 
> xrandr --output HDMI-0 --set output_csc tvrgb

Oh xrandr, I hadn't used that in years.
That worked thanks!

As for the patch themselves, I'll have to do more testing but so far I think it
works. Thanks Alex!