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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [SKL] 5k tiled dual DP (two-pipe, two-port) display sync issues"
href="https://bugs.freedesktop.org/show_bug.cgi?id=97244#c24">Comment # 24</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [SKL] 5k tiled dual DP (two-pipe, two-port) display sync issues"
href="https://bugs.freedesktop.org/show_bug.cgi?id=97244">bug 97244</a>
from <span class="vcard"><a class="email" href="mailto:ricardox.madrigal.maldonado@intel.com" title="Ricardo Madrigal <ricardox.madrigal.maldonado@intel.com>"> <span class="fn">Ricardo Madrigal</span></a>
</span></b>
<pre>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)</pre>
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