I'm able to get the internal display back to normal by restarting the X server from a text console.
At all points I've checked (before connecting external display, after connecting external display, after switching to text console, after restarting X) the i915_error_state sysfs file reads "no error state collected" -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/747205 Title: [arrandale] Black screen on all outputs when external VGA is connected -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
