Broadcast RGB property and Intel video driver

[Tom Horsley]

For the longest time, I've had this suspicion that some
update to the Intel graphics driver has made it screw
up the range of colors that can be displayed.

I just found this command:

xrandr --output HDMI2 --set "Broadcast RGB" Full

And the result is magical, the thin mist that had been
obscuring my screen was blown away, and everything is
crystal clear again.

But, it makes the screen flicker badly, and the Samsung
TV I'm using is slightly out of sync till I power cycle
it (or switch modes and switch back).

Anyone know if there is some way to set this permanently
as the default mode for the display rather than having to
run xrandr to change it at runtime?

(Apparently the default "Automatic" setting for this
property guesses wrong).