On Tue, 04 Mar 2014, Kenneth Johansson <ken@xxxxxxxxx> wrote:
> So I have a brix pro that is a i7 4700R with Intel Iris Pro Graphics 5200.
> and I 4k display from dell that can do 3840 x 2160 at 60 Hz (DP1.2)
>
> So both end should be ok. But when I try daily build of ubuntu as of
> yesterday all I get is 3840 x 2160 at 30Hz. I really hope this is just
> some software thing as 30Hz is not usable but the display is really
> crisp so I relly relly dont want to have to return it.
>
> I also noticed that when I go to console mode something gets configured
> wrong. I do get picture but the kernel manage to get the dimensions
> wrong so several 3-4 lines of the console is below the bottom and can't
> be seen.
Please try drm-intel-nightly branch of [1]. It has the code to enable
higher frequencies for DP 1.2:
commit 06ea66b6bb445043dc25a9626254d5c130093199
Author: Todd Previte <tprevite@xxxxxxxxx>
Date: Mon Jan 20 10:19:39 2014 -0700
drm/i915: Enable 5.4Ghz (HBR2) link rate for Displayport 1.2-capable devices
BR,
Jani.
[1] http://cgit.freedesktop.org/drm-intel/
--
Jani Nikula, Intel Open Source Technology Center
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