[Bug 93517] New: Laptop black screen [drm:intel_dp_start_link_train [i915]] *ERROR* failed to train DP, aborting

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93517

            Bug ID: 93517
           Summary: Laptop black screen [drm:intel_dp_start_link_train
                    [i915]] *ERROR* failed to train DP, aborting
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: jeroko at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org
     i915 platform: BDW
     i915 features: display/DP

Created attachment 120710
  --> https://bugs.freedesktop.org/attachment.cgi?id=120710&action=edit
dmesg(dmr.debug=0xe)

I'm using the kernel from drm-intel-nightly branch on the 2015-12-19, with the
i915.fastboot=1 module parameter (otherwise I get bug 92878). The 4K laptop
display shows some tearing, but it's functional. Sometimes there is a random
hotplug event ([drm:intel_get_hpd_pins] hotplug event received), then it goes
into training and the display goes black, I can't get it back unless I reboot
the laptop. I didn't plug or do anything to trigger that hotplug event.

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