All was well when running CentOS 6.2. Upgraded to 6.3, and X no longer seems to be able to detect my monitor, which results in a minimized list of available display resolutions and significantly reduced graphics performance (dragging windows is very choppy). I compared the Xorg.0.log files before and after the upgrade, and things start to fail at the line (which didn't exist when things worked): (--) MGA(0): Using shadowfb for RANDR 1.2 support
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