[Bug 79443] New: [BDW-Y ] DP display not light after entering the kernel.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=79443

          Priority: medium
            Bug ID: 79443
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [BDW-Y ] DP display not light after entering the
                    kernel.
        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 100148
  --> https://bugs.freedesktop.org/attachment.cgi?id=100148&action=edit
dmesg

==System Environment==
--------------------------
Regression: No. 

Non-working platforms: BDW-Y

==kernel==
--------------------------
origin/drm-intel-nightly: 9f53d4f6f55aa0c037f299dbe2986eec9151be9b(fails)
    drm-intel-nightly: 2014y-05m-28d-00h-00m-47s integration manifest
origin/drm-intel-next-queued: 38d811545c61cf188beac860615a08fb32f73eb1(fails)
    drm/i915/vlv: add pll assertion when disabling DPIO common well   
origin/drm-intel-fixes: d23db88c3ab233daed18709e3a24d6c95344117f(fails)
    drm/i915: Prevent negative relocation deltas from wrapping

==Bug detailed description==
-----------------------------
Booting with DP->HDMI ,4K monitor can't be lighted up after entering the
kernel. But normal monitor can be lighted up successfully, and original Ubuntu
Kernel can light up 4K monitor.

==Reproduce steps==
---------------------------- 
Boot with DP->HDMI 4k monitor.

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