[Bug 84265] New: [BSW Regression]System fails to find eDP monitor.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84265

          Priority: medium
            Bug ID: 84265
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [BSW Regression]System fails to find eDP monitor.
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: blocker
    Classification: Unclassified
                OS: Linux (All)
          Reporter: lei.a.liu at intel.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 106765
  --> https://bugs.freedesktop.org/attachment.cgi?id=106765&action=edit
dmesg

==System Environment==
--------------------------
Regression: Yes. Good commit:
9bbfd20abe5025adbb0ac75160bd2e41158a9e83(drm-intel-fixes).
        drm/i915: don't try DP_LINK_BW_5_4 on HSW ULX

Non-working platforms: BSW

==kernel==
--------------------------
-nightly: c920de3c631831526889a384b21da169b16b5c45 (fails)
    drm-intel-nightly: 2014y-09m-22d-12h-46m-45s UTC integration manifest
-queued: b680c37a4d145cf4d8f2b24e46b1163e5ceb1d35 (fails)
    drm/i915: DocBook integration for frontbuffer tracking
-fixes: 0f33be009b89d2268e94194dc4fd01a7851b6d51 (fails)
    Linux 3.17-rc6

==Bug detailed description==
-----------------------------
Boot machine up, eDP is black with backlight. eDP monitor fails to be detected
by I-G-T testdisplay, neither do xrandr. We find this issue on one machine, but
another machine works well.
meesg shows:
root at x-bsw02:~# /GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests/testdisplay -i
Connectors:
id      encoder status          type    size (mm)       modes
22      0       disconnected    HDMI-A  0x0             0
27      0       disconnected    DP      0x0             0
29      0       disconnected    HDMI-A  0x0             0
31      0       disconnected    DP      0x0             0

CRTCs:
id      fb      pos     size
8       0       (0,0)   (0x0)
   0 0 0 0 0 0 0 0 0 0x0 0x0 0
13      0       (0,0)   (0x0)
   0 0 0 0 0 0 0 0 0 0x0 0x0 0
18      0       (0,0)   (0x0)
   0 0 0 0 0 0 0 0 0 0x0 0x0 0

==Reproduce steps==
---------------------------- 
1. Boot machine up.
2. Check eDP monitor

==Bisect results==
----------------------------

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