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Hi cnobile,
Thanks for reporting this bug. I've reviewed your xorg.conf, Xorg.0.log, and the manufactor's manuals for both your video card and monitor. It looks to me that you've configured everything appropriately, and your hardware looks like it definitely should support this configuration. If it worked previously with this config, then it does sound likely that it is a regression in either xserver or the driver.
According to your log file, you're running xorg 7.2.0, with mga driver 1.4.6 (ABI version 1.1). A newer version of the xserver is available, however this may be a driver issue. The latest version of the mga driver is 1.4.6.1, which differs from 1.4.6.0 only by non-code changes, so upgrading your driver likely would not fix it. I'll report this upstream and we'll see if we can get some better troubleshooting directions.