Jochen, try the kernel in http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.7.10-raring/ or the last official 3.5 kernel from Quantal. I don't think you have to downgrade to Precise.
Jochen, try the kernel in http:// kernel. ubuntu. com/~kernel- ppa/mainline/ v3.7.10- raring/ or the last official 3.5 kernel from Quantal. I don't think you have to downgrade to Precise.