Comment 78 for bug 539467

As issues with the link power management are so controller specific, the solutions usually only fix one type. The last upstream changes added some framework to prevent bad effects only for a Nvidia controller. I would highly suggest to open individual bug reports for each controller.
When doing so, could you please add the exact symptom (like whether the fs gets remounted read-only or whether there are only error message). Also try using medium_power written to the policy as described above. Does that work ok?
And finally (if you are not already using a natty kernel) get the 2.6.38 mainline kernel from get http://kernel.ubuntu.com/~kernel-ppa/mainline/ to see whether by now that controller works. Generally when I asked about this upstream I got the impression that ICH controllers were supposed to work. Of course there are always exceptions...