Comment 8 for bug 36810

Currently X queries the card and queries the monitors (with 'ddcprobe') and gets a set of restrictions (minimum and maximums). X then puts these into an equation and ends up with results, discarding the ones that don't fit within the restrictions.

915resolution currently does its patching before these results have been calculated.

Yes, it would be possible, probably, to have you supply a modeline to 915resolution to paste it; but ideally the X server should do the whole lots (there is currently code in the CVS HEAD to do this).