[Bug 94592] New: [BSW] HDMI hotplug does not working

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94592

            Bug ID: 94592
           Summary: [BSW] HDMI hotplug does not working
           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 122380
  --> https://bugs.freedesktop.org/attachment.cgi?id=122380&action=edit
bsw-kern.log

Hardware: 
Motherboard: Aspire XC-704 
cpu model name : Intel(R) Pentium(R) CPU N3700 @ 1.60GHz 
cpu model : 76 
cpu family : 6 
Graphic card: Device 22b1 (rev 21)

Software:
Ubuntu 14.04
Bios: R01-A2
Kernel mainline 4.4.0 from
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
  commit afd2ff9b7e1b367172f18ba7f693dfb62bdcb2dc
  Author: Linus Torvalds <torvalds at linux-foundation.org>
  Date:   Sun Jan 10 15:01:32 2016 -0800
  Linux 4.4
drm: libdrm-2.4.67-5 ea07de9 from git://anongit.freedesktop.org/mesa/drm
mesa: tag mesa-11.1.2 7bcd827 from git://anongit.freedesktop.org/mesa/mesa
cairo: tag 1.15.2 db8a7f1 from git://anongit.freedesktop.org/cairo
waffle: master bb29b2a from git://github.com/waffle-gl/waffle
xorg-server-macros: tag: util-macros-1.19.0-2 d7acec2 from
git://git.freedesktop.org/git/xorg/util/macros
xserver: tag: xorg-server-1.18.1 23e60f9 from
git://git.freedesktop.org/git/xorg/xserver
xf86-video-intel: tag 2.99.917-560 d167280 from
git://anongit.freedesktop.org/xorg/driver/xf86-video-intel
libva: tag libva-1.7.0.pre1 35f1447 from
git://git.freedesktop.org/git/vaapi/libva
vaapi-intel-driver: tag 1.7.0.pre1 ab8e4e3 from
git://anongit.freedesktop.org/vaapi/intel-driver
IGT 1.14 364d378 from
http://anongit.freedesktop.org/git/xorg/app/intel-gpu-tools.git

External screen: Asus PB238Q

Steps:
------
1. Shutdown
2. Unplug external screen
3. Power on
4. Wait a moment
5. Hotplug HDMI cable

Actual result:
--------------
5. Screen turns on and displays "HDMI no signal" and turns off

Expected result:
----------------
5. Display works when hot-pluging screen after boot

Info:
-----
DUT is responding via SSH
Not reproduced when booting with the screen connected

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