My advice is usually wrong but how about 'superprobe' which comes with X, so you have it installed presumably. And 'discover' which will discover all sorts of hardware if you run it and is very friendly.
I have a Dell Inspiron 4000 with Sarge on it. It always starts at lowest resolution - have never bothered to fix it - just do: ctrl+alt+KP_+ (numpad +) twice, or however many times it needs.
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