<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <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 <a class="email" href="mailto:jani.nikula@intel.com" title="Jani Nikula <jani.nikula@intel.com>"> Jani Nikula</a> <pre>(In reply to <a href="show_bug.cgi?id=74266#c3">comment #3</a>) > 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). 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> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> <li>You are on the CC list for the bug.</li> </ul> </body> </html>