[Bug 83120] New: [BSW Regression]system boot fail

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=83120

          Priority: highest
            Bug ID: 83120
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [BSW Regression]system boot fail
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: blocker
    Classification: Unclassified
                OS: All
          Reporter: huax.lu at intel.com
          Hardware: All
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

==System Environment==
--------------------------
Regression: YES
Non-working platforms: BSW

==kernel==
--------------------------
origin/drm-intel-nightly: d82af52b1766594ece621e427f1604194ca2b415
    drm-intel-nightly: 2014y-08m-25d-23h-30m-00s integration manifest
origin/drm-intel-next-queued: 0f09bb2bf3d51a1e57e8dfc46e3c159170651c29
    drm/i915/bdw: Make sure error capture keeps working with Execlists
origin/drm-intel-fixes: 1a125d8a2c22b11741fc47d4ffcf7a5ffa044dd3
    drm/i915: don't try to retrain a DP link on an inactive CRTC

==Bug detailed description==
System boot fail, It happens on -nightly and -queued kernel, works well on
-fixes kernel.
It only happens on BSW. 

The latest known good commit: 3a5f87c286515c54ff5c52c3e64d0c522b7570c0
The latest known bad commit: 0f09bb2bf3d51a1e57e8dfc46e3c159170651c29

==Reproduce steps==
---------------------------- 
1. clean boot system.

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