Comment 17 for bug 756624

This sounds much like bug #745112 although the chipset is different.

Install and boot this kernel, and see if it fixes it:
  http://kernel.ubuntu.com/~kernel-ppa/mainline/drm-intel-next-proposed/

If so, then install this kernel and see if it also fixes it or not:
  http://people.canonical.com/~acelan/bugs/lp753189/

If it does, then that'll narrow down what patch the kernel team needs to pull.