[Bug 94822] System hangs when some video output is disabled/enabled on Skylake platform in double/triple display configuration

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94822

--- Comment #11 from cprigent <christophe.prigent at intel.com> ---
Created attachment 123571
  --> https://bugs.freedesktop.org/attachment.cgi?id=123571&action=edit
SKL-Y_4.6-rc6-447f243_kern.log

I reproduced a similar problem on SKL-Y with fresh kernel.

Steps:
-------
1. Connect HDMI and DP screens
2. Boot
3. xrandr --output eDP1 --off
4. xrandr --outout eDP1 --auto

Actual result:
----------------
4. eDP stays black. Command does not respond

Info
-----
Could be the same as bug 89055

Not reproduced with 4.6 rc6 from https://cgit.freedesktop.org/drm-intel/
commit 871c895c2d3192a93a701b31d2576184ab070c66
Author: Rodrigo Vivi <rodrigo.vivi at intel.com>
Date:   Thu May 5 16:49:48 2016 -0700
drm-intel-nightly: 2016y-05m-05d-23h-49m-21s UTC integration manifest

Setup
------
Hardware
Platform: 
CPU : Intel(R) Core(TM) m5-6Y57 CPU @ 1.10GHz (family: 6, model: 78  stepping:
3)
MCP : SKL-Y  D1 2+2
QDF : QJK9 
CPU : SKL D0
Chipset PCH: Sunrise Point LP C0       
CRB : SKY LAKE Y LPDDR3 RVP3 CRB FAB2
Software 
Linux OS : Ubuntu 16.10 64 bits
BIOS : SKLSE2R1.R00.B104.B01.1511110114
ME FW : 11.0.0.1191
Ksc (EC FW): 1.20
Kernel: drm-intel-nightly 4.6.0-rc6 447f243 from
http://cgit.freedesktop.org/drm-intel
   commit 447f2438e5ee3e9bb7d5cbe88fc44cdff74cc165
   Author: Daniel Vetter <daniel.vetter at ffwll.ch>
   Date:   Sun May 8 18:21:27 2016 +0200
   drm-intel-nightly: 2016y-05m-08d-16h-21m-00s UTC integration manifest
drm: libdrm-2.4.67-11 ea78c17 from http://cgit.freedesktop.org/mesa/drm/
xorg-server-1.18.0-254 44e1c97 from git://git.freedesktop.org/git/xorg/xserver
mesa: mesa-11.1.2 7bcd827 from http://cgit.freedesktop.org/mesa/mesa/
cairo: tag 1.15.2 db8a7f1 from http://cgit.freedesktop.org/cairo
libva: libva-1.7.0-1 2339d10 from http://cgit.freedesktop.org/libva/
vaapi-intel-driver: 1.7.0.pre1 ab8e4e3 from
http://cgit.freedesktop.org/vaapi/intel-driver

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