I'm not sure if this is the place to report this, but this bug seems relevant 
to the problem I'm experiencing.
Using raring beta, laptop thinkpad t400s with intel video and external monitor. 
Here are the steps to reproduce it:

1. I'm using the monitors in extended mode, no duplication.
2. I'm closing the lid of the laptop, thus the external becomes the main 
monitor. 
3. Starting a video in full screen. 
4. Opening the lid.

The video driver freezes, with "scratches" and random colors on screen,
and keeps frozen even if I close again the lid, or disconnect the
external monitor. No effect. The graphical env needs a restart to fix
this. I definitely had no such problems with quantal.

Also, upon boot with dual monitor setup, after logging into the system,
the screen stays shared between the two monitors(using half of each
monitor) for a few seconds, and then gets ok on the both monitors. Not a
critical issue, but this was introduced in raring. I haven't seen such
issues in quantal too.

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https://bugs.launchpad.net/bugs/779921

Title:
  Unity makes usage of dual monitors impossible

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