[Bug 96614] New: [BAT BDW] *ERROR* failed to enable link training/failed to start channel equalization

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96614

            Bug ID: 96614
           Summary: [BAT BDW] *ERROR* failed to enable link
                    training/failed to start channel equalization
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: All
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: imre.deak at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 124637
  --> https://bugs.freedesktop.org/attachment.cgi?id=124637&action=edit
dmesg

http://gfxci.rb.intel.com/archive/results/CI_IGT_test/RO_CI_DRM_531/ro-bdw-i7-5557U/

After suspend-to-ram and resume on an external DP output:

[  291.867864] [drm:intel_enable_shared_dpll] enable LCPLL 1350 (active 1, on?
0) for crtc 26
[  291.867865] [drm:intel_enable_shared_dpll] enabling LCPLL 1350
[  291.870603] [drm:intel_dp_aux_ch] dp_aux_ch timeout status 0x7145000c
...
[  291.950407] [drm:drm_dp_dpcd_access] too many retries, giving up
...
[  292.119813] [drm:intel_dp_sink_dpms] failed to enable sink power state
...
[  292.373085] [drm:intel_dp_link_training_clock_recovery [i915]] *ERROR*
failed to enable link training
...
[  292.458254] [drm:intel_dp_start_link_train [i915]] *ERROR* failed to start
channel equalization

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