[Bug 97244] [SKL] 5k tiled dual DP (two-pipe, two-port) display sync issues

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97244

--- Comment #24 from Ricardo Madrigal <ricardox.madrigal.maldonado at intel.com> ---
Hello

I just tried to reproduce the problem with following configuration:

KBL NUC, using a MST sunix conected with a mini-DP to DP and 2 connectors DP-DP
with 2 external monitor (acer) 3840 x 2160 (4K).

Attaching my configuration used to test

======================================
             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               : 5.12
bios release date           : 09/12/2016

======================================
        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                   : KBL-Nuc
motherboard model          : MS-B142
motherboard id             : MS-B1421
form factor                : Desktop
manufacturer               : Micro-StarInternationalCo.,Ltd.
cpu family                 : Core i7
cpu family id              : 6
cpu information            : Intel(R) Core(TM) i7-7500U CPU @ 2.70GHz
gpu card                   : Intel Corporation Device 5916 (rev 02) (prog-if 00
[VGA controller])
memory ram                 : 7.65 GB
max memory ram             : 64 GB
display resolution         : 1600x900
cpu thread                 : 4
cpu core                   : 2
cpu model                  : 142
cpu stepping               : 9
socket                     : Other
signature                  : Type 0, Family 6, Model 142, Stepping 9
hard drive                 : 111GiB (120GB)
current cd clock frequency : 540000 kHz
maximum cd clock frequency : 675000 kHz
displays connected         : DP-1 HDMI-A-2

======================================
             Firmware
======================================
dmc fw loaded             : yes
dmc version               : 1.1
guc fw loaded             : NONE
guc version wanted        : 0.0
guc version found         : 0.0

======================================
             kernel parameters
======================================
quiet splash fastboot drm.debug=0xe

Yes, this is still a problem.

Using 4K, you can connect only one  monitor first, change resolution to
1920x1080, then connect the other monitor an change the resolution to the same
(1920x10180)

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