Much to my surprise, I managed to get Ubuntu 9.04 working on an old Mac G4. The only thing wrong so far is that I can't figure out how to change the screen resolution, which is currently at 800x600. The System>Preferences>Display app doesn't give me any options but 800x600 and 640x480 even though the monitor is happy at higher resolutions. My monitor is a Sony Multiscan 17sfII which runs 1024x780 @ 75hz on the same Mac with no trouble. I tried an earlier version of Kubuntu (6.10) which had a bunch of monitor profiles with it and I was hoping this distro did too, but if it does I can't find them.

Isn't there a prefs file somewhere I can edit to deal with this cramped display? Sorry if this is newbie stuff, but really, in linux terms, that's what I am.