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

[bugzilla-daemon at freedesktop.org]

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

XiongZhang <xiong.y.zhang at intel.com> changed:

           What    |Removed                     |Added
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                 CC|                            |xiong.y.zhang at intel.com

--- Comment #20 from XiongZhang <xiong.y.zhang at intel.com> ---
It seems this is a common issue. I try it on a dell AIO machine which use
Haswell C3 stepping (id=0x0412, rev 06) and fix eDP to DDI port D. 

Today I compile drm-intel-next-queue branch then I get the same error dmesg as
yanbing. With Paulo's patch set, the error message "unclaimed register write"
have almost disappered on another HSW machine. But on this machine there are
still "unclaimed register" error message which may result in the failure of dp
link training.

I paste the dmesg with the name of edp_lost

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