Thanks for attaching enough information before anyone could ask for it :) It seems that the driver doesn't always get the DDC information from the monitor.
** Changed in: xorg (Ubuntu)
Importance: Undecided => Medium
Status: Unconfirmed => Confirmed
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X.org randomly picks 800x600 on a monitor capable of doing 1024x768
https://launchpad.net/bugs/95880
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