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<body><span class="vcard"><a class="email" href="mailto:xiong.y.zhang@intel.com" title="XiongZhang <xiong.y.zhang@intel.com>"> <span class="fn">XiongZhang</span></a>
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<a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [HSW bisected] Desktop-EDP can not work"
href="https://bugs.freedesktop.org/show_bug.cgi?id=61542">bug 61542</a>
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<td>xiong.y.zhang@intel.com
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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [HSW bisected] Desktop-EDP can not work"
href="https://bugs.freedesktop.org/show_bug.cgi?id=61542#c20">Comment # 20</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [HSW bisected] Desktop-EDP can not work"
href="https://bugs.freedesktop.org/show_bug.cgi?id=61542">bug 61542</a>
from <span class="vcard"><a class="email" href="mailto:xiong.y.zhang@intel.com" title="XiongZhang <xiong.y.zhang@intel.com>"> <span class="fn">XiongZhang</span></a>
</span></b>
<pre>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</pre>
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