[Bug 73705] New: External display not working - failed to enable link training, failed to start channel equalization

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=73705

          Priority: medium
            Bug ID: 73705
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: External display not working - failed to enable link
                    training, failed to start channel equalization
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: krzysiek at skyman.pl
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Intel
           Product: DRI

On DELL LATTITUDE E5540,
kernel-3.13.0-rc8
xorg-server-1.15
xf86-video-intel-2.99.907-r1

Boot hangs when KMS with external display connected (DVI-D/VGA to docking
station or VGA with docking station disconnected).

It boots completely fine when display is disconnected.
If I connect display with X started (in vt7 console) desktop hangs, I cannot
switch to different console.
If I connect display after starting X and switching to text console it works
until I switch to X console (vt7).

Few seconds after disconnecting console everything starts working correctly.

In dmesg it prints only:

[  158.165329] [drm:intel_dp_start_link_train] *ERROR* failed to enable link
training
[  158.168028] [drm:intel_dp_complete_link_train] *ERROR* failed to start
channel equalization

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