gfx folks - has this issue been looked at?

Please try -rc8 and drm-intel-nightly. Please add drm.debug=14 module parameter, and attach the dmesg again.

Created attachment 122555 [details]
dmesg

Screen is black for resolution=2500x1440 on BSW with last setup:

Platform: Braswell M
CPU : Intel(R) Celeron N3060 1.60GHz @ 1.6 GHz (family: 6, model: 76 stepping: 4)
SoC : BSW D0
QDF : K6XC
CRB : BRASWELL RVP Fab2
Mandatory Reworks : All
Feature Reworks: F28,F32,F33, F35 & F37
Optional reworks : O-02, O-03
 
Software
Linux OS: Ubuntu 15.10 64 bits
BIOS : BRAS.X64.B088.R00.1510270350
TXE FW : 2.0.0.2093
Ksc : 1.08
Kernel drm-intel-nightly: 2016y-03m-24d-14h-34m-29s UTC integration manifest
commit f5d413cccefa1f93d64c34f357151d42add63a84
Author: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Date:   Thu Mar 24 14:35:16 2016 +0000
 
drm: libdrm-2.4.67-5 ea07de9 from git://anongit.freedesktop.org/mesa/drm
mesa: tag mesa-11.1.2 7bcd827 from git://anongit.freedesktop.org/mesa/mesa
cairo: tag 1.15.2 db8a7f1 from git://anongit.freedesktop.org/cairo
waffle: master bb29b2a from git://github.com/waffle-gl/waffle
xorg-server-macros: tag: util-macros-1.19.0-2 d7acec2 from git://git.freedesktop.org/git/xorg/util/macros
xserver: tag: xorg-server-1.18.1 23e60f9 from git://git.freedesktop.org/git/xorg/xserver
xf86-video-intel: tag 2.99.917-560 d167280 from git://anongit.freedesktop.org/xorg/driver/xf86-video-intel
libva: tag libva-1.7.0.pre1 35f1447 from git://git.freedesktop.org/git/vaapi/libva
vaapi-intel-driver: tag 1.7.0.pre1 ab8e4e3 from git://anongit.freedesktop.org/vaapi/intel-driver
IGT 1.14 364d378 from http://anongit.freedesktop.org/git/xorg/app/intel-gpu-tools.git

Bug still exists on 

drm-intel-nightly @commit 9201a72678f7320974c28b9f704b802b2c1a43c1
Author: Jani Nikula <jani.nikula@intel.com>
Date:   Wed Jun 22 00:27:00 2016 +0300

    drm-intel-nightly: 2016y-06m-21d-21h-26m-35s UTC integration manifest

Failing resolution: 2560x1440

(In reply to Dhinakaran Pandiyan from comment #4)
> Bug still exists on 

Hey, if you go through the trouble of re-testing, please attach the fresh dmesg, all the way from boot, with drm.debug=14 module parameter added.

(In reply to Rami from comment #3)
> CPU : Intel(R) Celeron N3060 1.60GHz @ 1.6 GHz (family: 6, model: 76
> stepping: 4)
> SoC : BSW D0
> QDF : K6XC
> CRB : BRASWELL RVP Fab2
> Mandatory Reworks : All
> Feature Reworks: F28,F32,F33, F35 & F37
> Optional reworks : O-02, O-03

Also, we should really switch to production hardware when it's available. We don't want to waste time on debugging issues potentially caused by early hardware.

Dhinakaran, what hardware did you use?

Issue is not seen any more with the latest configuration:

============================================
 Software information
============================================
Kernel version                  : 4.10.0-rc3-drm-tip-commit-af72342+
Linux distribution              : Ubuntu 16.10
Architecture                    : 64-bit
Xorg-Xserver version            : 1.18.4
DRM version                     : 2.4.74
Cairo version                   : 1.15.5
Intel GPU Tools version         : Tag [intel-gpu-tools-1.17-115-g12e34d8] / Commit [12e34d8]
Kernel driver in use            : i915
Bios revision                   : 0.33
KSC revision                    : 0.16


 Hardware information
============================================
Platform                        : BSW
Motherboard model               : 10G9000NUS
Motherboard type                : BRASWELL Desktop
Motherboard manufacturer        : LENOVO
CPU family                      : Pentium
CPU information                 : Intel(R) Pentium(R) CPU  N3700  @ 1.60GHz

Kevin Strasser could you please re-test with the latest drm-tip configuration?

Confirmed by Luis the issue is not seen anymore, moving bug to resolved.  Kevin once you retest on your side do the following:

if the problem is gone change the status of the bug to closed
if the problem persist change the status of the bug to reopen and add update logs