Comment 11 for bug 1329566

Jim Bednar, spooky things like booting from Windows intermittently allow somethings to work is uncommon, but not unheard of. It's more towards a timing or firmware issue that linux is not dealing with properly, that obviously Windows has proper support for. Would you be able to boot into http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.17-rc2-utopic/ for a mainline test?