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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [snb dp dongle] DP-to-dual-HDMI (link_train issue?)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=49402#c18">Comment # 18</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [snb dp dongle] DP-to-dual-HDMI (link_train issue?)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=49402">bug 49402</a>
from <span class="vcard"><a class="email" href="mailto:jbarnes@virtuousgeek.org" title="Jesse Barnes <jbarnes@virtuousgeek.org>"> <span class="fn">Jesse Barnes</span></a>
</span></b>
<pre>On Tue, 16 Apr 2013 09:50:53 +0000
<a href="mailto:bugzilla-daemon@freedesktop.org">bugzilla-daemon@freedesktop.org</a> wrote:
<span class="quote">> <a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [snb dp dongle] DP-to-dual-HDMI (link_train issue?)"
href="show_bug.cgi?id=49402">https://bugs.freedesktop.org/show_bug.cgi?id=49402</a>
>
> --- <a href="show_bug.cgi?id=49402#c17">Comment #17</a> from Ville Syrjala <<a href="mailto:ville.syrjala@linux.intel.com">ville.syrjala@linux.intel.com</a>> ---
> I tried a few random things for this on IVB.
>
> - tried to send the training pattern and training lane set with one aux write
> instead of two.
> - tried to disable enhanced framing
> - tried to force some voltage swing/pre-emphasis values
> - tried with 6 bpc so that we'd get 1.62 links speed instead of 2.7
> - tried to send post cursor2 traning values in case that would trick the sink
> into cooperation
>
> Unfortunately none of that helped.
>
> The BIOS produces a picture with the dongle, so I tried to compare some of the
> register values. The main differences I saw were that the BIOS uses auto
> training for FDI, some of the M/N values were different, and of course the BIOS
> also has panel fitter active since it's using a 720x400 resolution.</span >
The m/n values could definitely be a factor. Maybe our DP values are
slightly off and causing some skew in the dongle?</pre>
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