[Bug 94213] New: [KBL] System needs long delay to boot with MST hub connected and then no multi stream

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94213

            Bug ID: 94213
           Summary: [KBL] System needs long delay to boot with MST hub
                    connected and then no multi stream
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: christophe.prigent at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 121843
  --> https://bugs.freedesktop.org/attachment.cgi?id=121843&action=edit
kern.log

Hardware
Platform: KABY LAKE-U 
CPU : Intel(R) Core(TM) @ 2.60GHz 
MCP : KBL-U  G0  2+2
QDF : QYQ8
Chipset PCH: SPT-LP C1       
CRB : KABY LAKE U DDR3L RVP7 CRB FAB1
BIOS : KBLSE2R1.R00.X015.B01.1511271314
ME FW : 11.5.0.1008
Ksc (EC FW): 1.20
Linux distribution: Ubuntu 15.10 64 bits
Kernel drm-intel-nightly 4.5.0-rc4_e459990 from
http://cgit.freedesktop.org/drm-intel/
  commit e4599905334de9349501a383afb8503a1dde5728
  Author: Jani Nikula <jani.nikula at intel.com>
  Date:   Thu Feb 18 19:13:56 2016 +0200
  drm-intel-nightly: 2016y-02m-18d-17h-13m-22s UTC integration manifest
drm: tag libdrm-2.4.66 9b77443 from http://cgit.freedesktop.org/mesa/drm/
mesa: edf774b from http://cgit.freedesktop.org/mesa/mesa/
cairo: tag 1.15.2 db8a7f1 from http://cgit.freedesktop.org/cairo
waffle: master bb29b2a from https://github.com/waffle-gl/waffle
xorg-server-macros: master d7acec2 from
git://git.freedesktop.org/git/xorg/util/macros
libva: tag libva-1.6.1 1f026de from http://cgit.freedesktop.org/libva/
vaapi-intel-driver: e41040f from http://cgit.freedesktop.org/vaapi/intel-driver
Firmware
DMC 1.26 from https://01.org/linuxgraphics/downloads/skylake-dmc-1.26
MST Hub: MSTDP124DP

Steps:
------
1. Connect hub to DUT and 2 monitors to the hub (all is Display Port)
2. Boot
3. Wait

Actual result:
-------------
3. DUT needs several minutes to boot. External screens do not display anything.

Expected result:
----------------
3. DUT boots normally and display works on external screen

Info:
-----
DUT boots normally without the hub connected
It is reproduced with only one screen connected to the hub

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