In the nvidia release notes for driver version 190.53
(http://www.nvidia.com/object/linux_display_amd64_190.53.html), there's
mention in the release notes of a DisplayPort bugfix:
- Fixed a problem that caused resolution limitations or corruption
on certain DisplayPort devices such as the Apple 24" Cinema display or
some DisplayPort to VGA adapters.
This could be related to the power management issue.
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Primary monitor doesn't wake up out of power save mode
https://bugs.launchpad.net/bugs/473436
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