I wonder if the monitor reports these modes as fine, but the card can not drive 
them, and bails out instead of falling back on other modes.
Can you please run:
 sudo ddcprobe > ddcprobe.txt
and attach the file ddcprobe.txt?

-- 
ATI Rage: Unsuitable videomode autoselected
https://bugs.launchpad.net/bugs/148117
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