Thanks for testing against so many different distros.  Can you attach an
xorg.conf and Xorg.0.log and xrandr --verbose from Sabayon or one of the
other cases where it did work?

This sort of sounds like broken edid from the monitor, but that data is
not shown in this Xorg.0.log.  Please see
http://wiki.ubuntu.com/X/Troubleshooting/ for guidance on collecting and
analyzing the edid to see if the error can be spotted.

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With or without the NVIDIA driver installed the system while booting appears to 
initially detect and display the correct resolution 1920x1200 but late in the 
boot-process it reverts (regardless of correct and trouble-free procedure for 
saving) to 1280x1024
https://bugs.launchpad.net/bugs/473848
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