Comment 23 for bug 1310489

Just a comment that I never saw gpu-manager *modify* xorg.conf -- it just renamed it to xorg.conf-DATE leaving me with no xorg.conf at all (which in my case was enough to cause major problems). Commenting out all of the lines in gpu-manager.conf seems to have stopped it from running, which solved my issue for now.

If something is actually changing the content of your xorg.conf file, I'd be more suspicious of the graphics driver installer or perhaps some helper program that came with the driver.