Comment 65 for bug 1386005

Workaround from https://bugs.launchpad.net/ubuntu/+source/cryptsetup/+bug/1500751 comment #68 confirmed correct and working. Also, bug not present in Ubuntu Wiy for 4.2.x kernels due to i915 driver being in an appropriate directory. However, intel_pstate driver in Wily AFU'd, so you still have to apply the fix and run an old kernel if you actually want a working computer.