Comment 198 for bug 1068404

Rafael, which Ubuntu version are you using? And what's the kernel version? For the external corruption you mentioned, some fix is needed in Intel kernel driver, and probably you can try the kernel image below.

http://people.canonical.com/~tjaalton/i915-dkms/release/intel-i915-backport-3.8-dkms_3.8.6.0_all.deb