Same issue with a Intel sandy bridge system. But the problem started to show up 
around a week ago, probably after some update. before that 12.10 worked fine. 
The trick suggested here 
https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/995397 (restarting 
lightdm) will get it running again. 
The Xorg log (complete log attached):
Fatal server error:
[     1.840] Cannot run in framebuffer mode. Please specify busIDs        for 
all framebuffer devices
[     1.840] 
[     1.840] (EE) 
Please consult the The X.Org Foundation support 
         at http://wiki.x.org
 for help. 
[     1.840] (EE) Please also check the log file at "/var/log/Xorg.0.log" for 
additional information.
[     1.840] (EE) 
[     1.843] Server terminated with error (1). Closing log file.

** Attachment added: "Xorg.fail.log"
   
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1071101/+attachment/3442695/+files/Xorg.fail.log

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https://bugs.launchpad.net/bugs/1071101

Title:
  nearly every other boot I get "Low Graphics Mode" message.

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