[Intel-gfx] brix pro + dell UP3214Q, 3840x2160 @ 60 Hz

[Jani Nikula]

On Tue, 04 Mar 2014, Kenneth Johansson <ken at kenjo.org> 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 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

BR,
Jani.


[1] http://cgit.freedesktop.org/drm-intel/


-- 
Jani Nikula, Intel Open Source Technology Center