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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [HD 4400] DisplayPort resolution limited to 1920x1200"
href="https://bugs.freedesktop.org/show_bug.cgi?id=74266#c11">Comment # 11</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [HD 4400] DisplayPort resolution limited to 1920x1200"
href="https://bugs.freedesktop.org/show_bug.cgi?id=74266">bug 74266</a>
from <span class="vcard"><a class="email" href="mailto:jani.nikula@intel.com" title="Jani Nikula <jani.nikula@intel.com>"> <span class="fn">Jani Nikula</span></a>
</span></b>
<pre>(In reply to <a href="show_bug.cgi?id=74266#c3">comment #3</a>)
<span class="quote">> Annoyingly we don't print out the debug information about the link prior to
> discarding the mode, but the issue here is that the bandwidth required to
> send the full 2560x1440 is greater than the number of DP lanes connecting to
> the dock (which one presumes was penny pinched to only support 1080p).</span >
Only two lanes but both the sink and source (Haswell) support 5.4 GHz
bandwidth. It should be enough. Driver support was only just merged in
commit 06ea66b6bb445043dc25a9626254d5c130093199
Author: Todd Previte <<a href="mailto:tprevite@gmail.com">tprevite@gmail.com</a>>
Date: Mon Jan 20 10:19:39 2014 -0700
drm/i915: Enable 5.4Ghz (HBR2) link rate for Displayport 1.2-capable
devices
which isn't upstream yet. Did you try drm-intel-nightly?</pre>
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