Comment 1 for bug 176360

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Scott Kitterman (kitterman) wrote : Re: [Bug 176360] [NEW] [Kubuntu7.10]Adjusting Gamma parameter in system->display settings messes up the xorg.conf. Display defaults to lowest resolution on rebooting

The short answer is because Guidance Displayconfig (which is the program in
question) does not work at all well with modern X.org. It has been removed
and replaced in Intrepid, so the chances of any significant bugfix work
being done on it are very low.