Comment 6 for bug 1251065

This is proving to be a bit tricky, commit fa55583797d12b10928a1813f3dcf066637caf5e causes a regression on the i915 driver on resume causing screen corruption, making it hard to see resume failures on the console. I've now figured out between which two points the resume hangs, but I need to now revert the above commit on each bisect so I can see what's happening when it hangs. But I am slowly making some progress.