I know it's an old thread, but it's exactly the same matter, so....
When I create the file in xorg.conf.d my sytem won't boot anymore and when I edit xorg.conf it doesn't change anything and still shows me that Color Tiling is disabled. Any suggestion what I could try?
I'm running Fedora with Kernel 3.14.4-200 and Mesa 10.1.3.
Thanks for your help.