This seems to be the same problem described on http://ubuntuforums.org/showthread.php?t=502674
It says it is solved by resetting the SMC to factory defaults (http://support.apple.com/kb/HT1411?viewlocale=en_US). However, this seems like a work-around rather than a solution.
This seems to be the same problem described on http:// ubuntuforums. org/showthread. php?t=502674
It says it is solved by resetting the SMC to factory defaults (http:// support. apple.com/ kb/HT1411? viewlocale= en_US). However, this seems like a work-around rather than a solution.