Public bug reported:

eDP on haswell graphics puts some stuff in dmsg that is scary to users.
Worse, these messages are displayed on suspend/resume, and because we
don't have vt-switchless resume support in ubuntu yet, when the graphics
don't work it seems like these messages are the culprit.

Dmesg:
[11577.928164] [drm:intel_dp_set_link_train] *ERROR* Timed out waiting for DP 
idle patterns
[11577.928167] [drm:i915_write32] *ERROR* Unknown unclaimed register before 
writing to 64040

** Affects: linux
     Importance: Unknown
         Status: Unknown

** Affects: linux (Ubuntu)
     Importance: Undecided
     Assignee: Timo Aaltonen (tjaalton)
         Status: Confirmed

** Bug watch added: freedesktop.org Bugzilla #58769
   https://bugs.freedesktop.org/show_bug.cgi?id=58769

** Also affects: linux via
   https://bugs.freedesktop.org/show_bug.cgi?id=58769
   Importance: Unknown
       Status: Unknown

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https://bugs.launchpad.net/bugs/1138700

Title:
  Using eDP leaves kernel log with "Timed out waiting for DP idle
  patterns" messages

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