Change gamma setting

Hi,

So, when I updated to kernel 3.11-rc5 to get the HDMI audio to work (see earlier thread here) with it the gamma /brightness/contrast of the video output changed. With the default kernel everything looked good but with the new kernel dark areas in movies look very grayish and fugly. I tried adjusting the gamma with x-gamma but that only seems to affect the desktop and not overlay video. Is there any way to adjust gamma/color settings for the video drivers directly, just like you can on windows?

EDIT: Ok, so after some additional research, I think it has to do with the colorspace setting rather than gamma, that the new kernel outputs in Limited RGB (16-235) rather than Full RGB (0-255). Don't ask me why. Either way, can I change this back to Full RGB?

EDIT2: Nvm, I found a solution!

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

Unfortunatly this setting can't be set in xorg.conf, so I must add is as startup script to make it last after reboot.