Congratulations on going stable!  I am experiencing this issue as well,
and this is the one bug keeping me from using Nouveau.  I would really
like to have xrandr 1.2 support, so please let me know if there is
anything I could provide to help troubleshoot this.

Notes:
Thinkpad W510

01:00.0 VGA compatible controller: NVIDIA Corporation GT216 [Quadro FX
880M] (rev a2)

When using the nvidia driver, the following option needs to be added to the X 
config file.
Option "RegistryDwords" "EnableBrightnessControl=1"

When using the nouveau driver, brightness controls works fine.  After
suspend and resume, brightness stuck on max.

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https://bugs.launchpad.net/bugs/921321

Title:
  nouveau: dark screen after suspend/resume

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