On 13 August 2012 01:48, Graeme Gill <graeme@xxxxxxxxxxxxx> wrote: > As I understand it, the nvidia driver doesn't properly implement XRANDR. > In particular, it fails to implement support for loading the VideoLUTs. You need the brand new driver: http://www.phoronix.com/scan.php?page=news_item&px=MTE1MDM Richard