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[mabuka <1138700@xxxxxxxxxxxxxxxxxx>]

It is hard for me to believe that this bug won't be fixed for 12.04 /
Precise. Can anyone tell me a workaround that I could apply? It is a
real pain working with a machine that switches to text mode more than
once a minute and displays the message

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

When this happens, I have to press the Alt key in order to return to the
graphic display. Please help me. Thanks in advance!

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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

Status in HWE Next Project:
  Fix Released
Status in The Linux Kernel:
  Fix Released
Status in “linux” package in Ubuntu:
  Fix Released
Status in “linux” source package in Quantal:
  Fix Released
Status in “linux” source package in Raring:
  Won't Fix

Bug description:
  [Impact]

   * This confuses end users. They think that this is a relevant message instead of an
     unimportant accident to the eDP

  [Test Case]

   * Use an eDP haswell system
   * See this message in dmesg

  [Regression Potential]

   * Low. This patch just skips a port check on eDP machines
   * It has already been tested on eDP machines

  [Other Info]

   * private bug 1097143

  [Original message]

  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

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