[Bug 93772] 4k eDP display blanks on intel-drm-nightly

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93772

--- Comment #7 from Ricardo Madrigal <ricardox.madrigal.maldonado at intel.com> ---
Hello,

I just tried to reproduce the problem with following configuration:

BDW NUC, emulating eDP with external Display (Asus) 1920 x 1200 as principal
display

Attaching a 4k display (3840x2160). 

And the next configuration:


======================================
             Software
======================================
kernel version              : 4.12.0-rc3-drm-tip-ww22-commit-187376e+
architecture                : x86_64
os version                  : Ubuntu 17.04
os codename                 : zesty
kernel driver               : i915
bios revision               : 5.6
bios release date           : 05/11/2017

======================================
        Graphic drivers
======================================
mesa                      : 17.0.3
modesetting               : modesetting_drv.so
xorg-xserver              : 1.19.3
libdrm                    : 2.4.76
libva                     : 1.7.3-2
vaapi (intel-driver)      : 1.7.3
cairo                     : 1.14.8-1
intel-gpu-tools           : 1.17-1

======================================
             Hardware
======================================
platform                   : BDW
motherboard id             : NUC5i7RYB
form factor                : Desktop
cpu family                 : Core i7
cpu family id              : 6
cpu information            : Intel(R) Core(TM) i7-5557U CPU @ 3.10GHz
gpu card                   : Intel Corporation Iris Graphics 6100 (rev 09)
(prog-if 00 [VGA controller])
memory ram                 : 15.58 GB
max memory ram             : 16 GB
display resolution         : 1600x900
cpu thread                 : 4
cpu core                   : 2
cpu model                  : 61
cpu stepping               : 4
socket                     : Socket BGA1168
signature                  : Type 0, Family 6, Model 61, Stepping 4
hard drive                 : 111GiB (120GB)
current cd clock frequency : 540000 kHz
maximum cd clock frequency : 540000 kHz
displays connected         : DP-2 DP-3


Everything works fine and normally with Ubuntu.

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