Comment 29 for bug 771758

@Mauricio, the test kernel I mentioned didn't pan out because the quirks I was looking at wouldn't apply to your machine. I did find an upstream patch however that would change the way acer-wmi interacts with the bios for your machine, and I think it's worth a try to see whether or not this helps with your problem. A test build is available at:

http://people.canonical.com/~sforshee/lp771758/linux-2.6.38-10.44~lp771758v201106061621/

Please let me know whether or not this help with your problem. Thanks!