Why does Ubuntu ignore my xorg.conf?

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http://askubuntu.com – Hi my Ubuntu has developed a strange problem. It just ignores my xorg setting and falls back to what I presume is a hardware default setting. In more detail when I do a clean install it automatically sets my resolution to 1920x1080i @60hz, I then change this to 1920x1080p @60hz but this causes the resolution to set its self to 1920x1080i @50hz after a reboot, and then no matter what I set the xorg to it always boots at this resolution. I can change the setting in the nvidia-settings dialog (yes I have ran it as root) but it never saves my setting and falls back to this resolution. Heres som (HowTos)