This bug was fixed by commit 00eed9c814cb8f281be6f0f5d8f45025dc0a97eb upstream (USB: xhci: correctly enable interrupts), which went into 3.8.5 stable. I can confirm that the kernel in experimental fixes the problem. The patch also went into 3.2.42, which is not yet in wheezy/sid. -- Frederik Himpe <fhimpe@vub.ac.be>