[Bug 87220] [BDW-H]VGA port unable to work

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87220

--- Comment #1 from XiongZhang <xiong.y.zhang at intel.com> ---
Created attachment 110972
  --> https://bugs.freedesktop.org/attachment.cgi?id=110972&action=edit
Dmesg from drm-intel-nightly branch

I used latest drm-intel-nightly branch
8b7ac3d drm-intel-nightly: 2014y-12m-16d-17h-44m-52s UTC integration manifest

Through the following steps, I get the dmesg:
1. Only connect vga screen to BDW-H
2. Boot drm-intel-nightly kernel with drm.debug=0xe and i915.modeset=0
3. rmmod snd-hda-intel and rmmod i915
4. dmesg -c
5. modprobe i915 modeset=1
6. the vga screen flicker then become blackscreen

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