[Bug 87855] New: [BDW]igt/kms_flip/rcs-wf_vblank-vs-dpms causes *ERROR* too many voltage retries, give up

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87855

            Bug ID: 87855
           Summary: [BDW]igt/kms_flip/rcs-wf_vblank-vs-dpms causes *ERROR*
                    too many voltage retries, give up
           Product: DRI
           Version: unspecified
          Hardware: All
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: huax.lu at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 111506
  --> https://bugs.freedesktop.org/attachment.cgi?id=111506&action=edit
test log

==System Environment==
--------------------------
Regression: not sure

Non-working platforms: BDW

==kernel==
--------------------------
drm-intel-nightly/4fa23142a15526f4a4b5df61f26eacdd558a849a
commit 4fa23142a15526f4a4b5df61f26eacdd558a849a
Author: Daniel Vetter <daniel.vetter at ffwll.ch>
Date:   Fri Dec 19 15:33:33 2014 +0100

    drm-intel-nightly: 2014y-12m-19d-14h-33m-07s UTC integration manifest

==Bug detailed description==
-----------------------------
It causes <3>[  993.707284] [drm:intel_dp_start_link_train [i915]] *ERROR* too
many voltage retries, give up" on drm-intel-nightly kernel when run automation
testing. run the binary, I am unable to reproduce the fail. I am not sure which
case impacts it.
Following cases also has this error:
igt/kms_flip/flip-vs-dpms-off-vs-modeset
igt/kms_flip/flip-vs-dpms-off-vs-modeset-interruptible
igt/kms_flip/single-buffer-flip-vs-dpms-off-vs-modeset
igt/kms_flip/single-buffer-flip-vs-dpms-off-vs-modeset-interruptible

==Reproduce steps==
---------------------------- 
1. Run full igt

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