It looks like the same root cause. The misdetection in 3731 _usually_
just reduces the number of available resolutions to one or two for most
people, but it is possible in some rare cases (such as yours) for it to
reduce the number to zero.
I believe that the crash is due to it finding no resolutions.
However, normally 3731 is resolved by manually adding VertRefresh and
HorizSync, so since that isn't working in your case, I'll de-dupe it.
Possibly this has been reported upstream to xorg already...
Did you try moving aside the xorg.conf and restarting X?
** This bug is no longer a duplicate of bug 3731
Xorg resolution falling back to 640x480 and/or 800x600 when h/v freqs
incorrect
** Changed in: xorg (Ubuntu)
Status: Unconfirmed => Needs Info
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ATI FireGL V5200 not working at all
https://bugs.launchpad.net/bugs/118225
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