[Bug 74266] [HD 4400] DisplayPort resolution limited to 1920x1200

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=74266

--- Comment #11 from Jani Nikula <jani.nikula at intel.com> ---
(In reply to comment #3)
> 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 <tprevite at gmail.com>
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?

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