On 2014-03-04 17:12, Jani Nikula wrote: > On Tue, 04 Mar 2014, Kenneth Johansson 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: Tried that same result. I turned on drm.debug=0x4 but for me the only thing I can see is that the 60Hz mode is not in the list > commit 06ea66b6bb445043dc25a9626254d5c130093199 > Author: Todd Previte > 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/ > >