Originally Posted by AaronP
Well, you changed the requested mode from 1280x768 to 1280x1024, so this doesn't really apply to the former, but 1280x1024 is getting rejected because it's bigger than the default "native" resolution of 640x480. Please add Option "ExactModeTimingsDVI" and try again. You may also need to set Option "ModeValidation" "NoDFPNativeResolutionCheck" to override the size check.
OK, now it *finally* worked and I'm a very happy camper
The rez on my secondary display is now not just (almost) twice as high, but it also fits the primary display's rez to a T (so I can move windows back & forth w/l losing sight of 'em).
But can you pleaaaase (with a big cheese) explain to me what O just did?
What are the meanings of all those many, many options I've now put into my X11 config file?