[Bug 65995] New: [HSW mobile]eDP can't light up when boot up, BIOS can display well

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=65995

          Priority: medium
            Bug ID: 65995
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [HSW mobile]eDP can't light up when boot up, BIOS can
                    display well
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: major
    Classification: Unclassified
                OS: All
          Reporter: yangweix.shui at intel.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 81148
  --> https://bugs.freedesktop.org/attachment.cgi?id=81148&action=edit
dmesg: eDP can't light up when machine booting up

Environment:
---------------------
HW info: 
Acer Haswell Notebook Aspire V3 772G 17.3 ; 
Host bridge ID=0x0c04 (rev 06);
VGA ID=0x0416 (rev06);
CPU: i7-4702MQ 2.2GHz; 
BIOS:v1.04 MEM: 4G ;

Kernel: (drm-intel-nightly)19b2dbde5732170a03bd82cc8bd442cf88d856f7
Some additional commit info:
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Wed Jun 12 10:15:12 2013 +0100

    drm/i915: Restore fences after resume and GPU resets

Description:
---------------------
I have tried many kernels, when machine boot up, eDP can display well in BIOS,
but failed to display after system finished initialized. If I removed i915, eDP
can display again.

The followed phenomenon:
1. eDP failed to display if boot to level 3.
2. eDP light up again by start X(but it need to connect another display pipe).

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