https://bugs.freedesktop.org/show_bug.cgi?id=55692
--- Comment #18 from Alexandre Demers alexandre.f.demers@gmail.com --- Is VM enabled or disabled on your system? I'm experiencing a similar bug with kernel 3.7-rc1, but it is working fine with 3.6. VM is enabled on my system, I'll try to disable it when I'll get home to see if that helps and I'll also try to bisect the kernel commit that screwed things for me.