[Bug 82611] New: [BDW Regression ]HDMI hot plug case ERROR.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=82611

          Priority: medium
            Bug ID: 82611
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [BDW Regression ]HDMI hot plug case ERROR.
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: lei.a.liu at intel.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 104611
  --> https://bugs.freedesktop.org/attachment.cgi?id=104611&action=edit
dmesg

==System Environment==
--------------------------
Regression: Yes. Before this issue , HDMI hot plug cause system hang. 

==kernel==
--------------------------
-nightly: 723dbbfb6ce02b5662c0c4cac9be3bcdfbb11d35 (failed)
    drm-intel-nightly: 2014y-08m-12d-19h-37m-18s integration manifest
-queued: c0ee2e894256703265604a7455d614409c010ce8 (failed)
    drm/i915: Unify ivb_update_cursor() and i9xx_update_cursor()
-fixes: be71eabebaf9f142612d34d42292b454e984dcb5 (failed)
    Revert "drm/i915: Enable semaphores on BDW"

==Bug detailed description==
-----------------------------
bug 81856 block my bisect.
When I unplug or plug in HDMI monitor, ERROR message will be outputted like
below: 
[  305.444350] [drm:intel_dp_start_link_train] *ERROR* failed to enable link
training
[  305.446126] [drm:intel_dp_set_signal_levels] Using signal levels 00000000
[  305.453020] [drm:drm_dp_dpcd_access] too many retries, giving up
[  305.453021] [drm:intel_dp_start_link_train] *ERROR* failed to enable link
training
[  305.454789] [drm:intel_dp_set_signal_levels] Using signal levels 00000000
[  305.461683] [drm:drm_dp_dpcd_access] too many retries, giving up
[  305.461685] [drm:intel_dp_start_link_train] *ERROR* failed to enable link
training
[  305.463463] [drm:intel_dp_set_signal_levels] Using signal levels 00000000
[  305.470267] [drm:drm_dp_dpcd_access] too many retries, giving up
[  305.470269] [drm:intel_dp_start_link_train] *ERROR* failed to enable link
training
[  305.473171] [drm:intel_dp_set_signal_levels] Using signal levels 00000000
[  305.479570] [drm:intel_dp_set_signal_levels] Using signal levels 01000000
[  305.486403] [drm:drm_dp_dpcd_access] too many retries, giving up
[  305.486405] [drm:intel_dp_start_link_train] *ERROR* failed to update link
training
[  305.489126] [drm:intel_dp_set_signal_levels] Using signal levels 01000000
[  305.495960] [drm:drm_dp_dpcd_access] too many retries, giving up
[  305.495962] [drm:intel_dp_complete_link_train] *ERROR* failed to update link
training
[  305.497507] [drm:drm_dp_mst_allocate_vcpi] initing vcpi for 619 16
[  305.518263] [drm:intel_mst_enable_dp] 1


==Reproduce steps==
---------------------------- 
1. unplug HDMI monitor
2. plug HDMI monitor

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