Comment 49 for bug 1300349

Christopher, the first good commit is 344c5bbcb7a282cc59e2f111c8801106c4fe315c.

Fortunately I learned something from the first time I did this. Since the problem was in the function intel_dp_compute_config in the file drivers/gpu/drm/i915/intel_dp.c, there were only 4 commits to check. The first good commit was one of them, but the later commit 2d65a9f48fcdf7866aab6457bc707ca233e0c791 looks like a further refinement.