The logs indicate that the correct mode of 1680x1050 at 60Hz is set up.
Can you please try the MacModel options, as described by "man radeon"?
** Changed in: xserver-xorg-video-ati (Ubuntu)
Status: Confirmed => Incomplete
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Blank screen and incorrectly detected screen resolution with Mac Mini G4
and Radeon 9200
https://bugs.launchpad.net/bugs/340940
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