[Bug 61542] [HSW bisected] Desktop-EDP can not work

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=61542

--- Comment #4 from yanbing <bingx.a.yan at intel.com> ---
(In reply to comment #3)
> 1 - EDP works for me here on my mobile machine.
> 

EDP also works for us on mobile machine,this bug just exist on hsw-desktop.

> 2 - The dmesg complains about EDID being zero. I have seen this message
> sometimes (on HDMI), and just rebooting seemed to have "fixed" the problem
> for me. Do you see this "EDID is zero" message all the time?
> 

Yes,I see "EDID is zero" message all the time not only on bad commit but also
on some good commit,you can see it on the "EDP-oldrevert-good.dmesg"

> 3 - Dmesg also says that "pipe A is connected to port D and pipe B is
> connected to port C". Are you using eDP only?
> 

For comparison test,I connect EDP and HDMI at the same time.But now I just only
connect EDP  and get some new info at 4-2 & 4-3.The first bad commit was still
that one.

> 4 - Can you please revert the code to a state where it worked, boot it and
> send me the dmesg?

Just only using EDP,I got some dmesg again.

4-1: By using first bad commit,just only using EDP and attched on
"EDP-only-firstbad.dmesg"

4-2: When bisect the first bad commit and revert it at once (not git pull to
the latest),it works well just only using EDP. I attached on
"EDP-oldrevert-good.dmesg".

4-3: Git pull to the latest,and revert the code.Using only EDP is black,but
EDP+HDMI works well. I attached on "EDP-newrevert.dmesg"

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