I've followed these instructions https://wiki.ubuntu.com/Kernel/MainlineBuilds and installed kernel 2.6.36.999 from http://kernel.ubuntu.com/~kernel-ppa/mainline/daily/current/
This appears to have resolved the problem.
I've followed these instructions https:/ /wiki.ubuntu. com/Kernel/ MainlineBuilds and installed kernel 2.6.36.999 from http:// kernel. ubuntu. com/~kernel- ppa/mainline/ daily/current/
This appears to have resolved the problem.