Christoph Paasch, given the problem is a regression going from Oneiric to Precise, it wouldn't hurt to bisect the kernel via https://wiki.ubuntu.com/Kernel/KernelBisection to shed more light on the issue. Be careful as the proprietary nvidia drivers many not work out using the mainline, or previous Ubuntu kernels.
Christoph Paasch, given the problem is a regression going from Oneiric to Precise, it wouldn't hurt to bisect the kernel via https:/ /wiki.ubuntu. com/Kernel/ KernelBisection to shed more light on the issue. Be careful as the proprietary nvidia drivers many not work out using the mainline, or previous Ubuntu kernels.