Comment 4 for bug 768184

I have a suspicion this might be the same as or similar to bugs 767511 and 767425 - different error codes, but same chip and all are regressions that started within the past couple weeks it appears.

Let's let it freeze a couple more times, so you get a definite feel for the frequency and conditions of the freeze. Then, I want you to try booting to an earlier kernel from a week or two ago - prior to when you started noticing the freezes.

Hopefully you still have an old kernel installed; just hold down the left shift key during boot and it should let you select whatever kernels are already there. If not, you can install the older kernels from https://launchpad.net/ubuntu/+source/linux/+publishinghistory. For instance, to install the -8.41 kernel, go here:

https://launchpad.net/ubuntu/+source/linux/2.6.38-8.41/+buildjob/2429621

You'll want the linux-image-2.6.38-8-generic-pae deb; I don't think you will need anything else but if the installer complains you can snag other .debs as needed.