[Bug 87736] [BDW] Hot unplug VGA EFP from docking then plug in, find EFP cannot be detected anymore

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87736

--- Comment #6 from Humberto Israel Perez Rodriguez <humberto.i.perez.rodriguez at intel.com> ---
Hi Phidias Chiang(In reply to Phidias Chiang from comment #0)
> Created attachment 111357 [details]
> error message when unplugging VGA cable in 3.13.0-34 kernel
> 
> [Summary]
> Hot unplug VGA EFP from docking then plug in, find EFP cannot be detected
> any more.
> 
> [Steps]
> 1. Boot up the system with docking
> 2. Plug the VGA port
> 3. Fn+F4 to trigger the external monitor display
> 4. Unplug the VGA port and replug again
> 5. Check the external monitor
> 
> [Expected results]
> 1. External monitor still can display.
> 
> [Actual results]
> 1. External monitor can't display.
> 
> [linux-3.13.0-34-generic]
> After unplugging VGA and replugging back, system is blocked
> when executing `cat /sys/class/drm/card0-DP-2/status`.
> Test with Fn+F4 or running `xrandr` at the moment system hangs.
> 
> [linux-3.13.0-38]
> After detaching DP and connection VGA,
> it probes and outputs to external monitor correctly,
> but if unplug VGA and replug again it failed
> (disconnected in /sys/class/drm/card0-DP-2/status)

Hi Phidias Chiang :

I've check this issue with the following platform with latest drm-intel-nightly
and drm-intel-testing kernels with a miniDP to VGA dongle (because BDW-U nuc
doest has VGA port) follow your exacts steps and i couldn't find the issue, so
could you provide a full dmesg (adding this to your grub initcall_debug
drm.debug=0xe) and xrandr output for both cases where you plug and unplug the
VGA please as well the kernel version (uname -r) ?


Hardware Configuration : BDW-U Nuc
----------------------------------
CPU : Intel(R) Core(TM) i7-5557U CPU @ 3.10GHz
GPU : Intel Corporation Broadwell-U Integrated Graphics
Memory ram : 8 GB
Dongle : miniDP to VGA (StarTech E328232)

Software Configuration :
---------------------------------
Ubuntu 14.04.03 x86_64
Xserver : 1.17.4  (commit : 2c7fa2a)
libdrm : 2.4.65 (commit :c349616)
Xf86-video-intel : 2.99.917 (commit : baec802)
Mesa : 11.0.4 (commit : 31bf247)
Libva : 1.6.1 (commit : 613eb96)
Intel-driver : 1.6.1 (commit : 35858c6)
Cairo : 1.14.4 (commit : 0317ee7)
BIOS : 5.6


Kernel : latest drm-intel-testing (4.3.0-rc6-testing)
commit 87074657f22e38163e712ca417e1a398d00096b6
Author: Daniel Vetter <daniel.vetter at ffwll.ch>
Date:   Fri Oct 23 11:56:52 2015 +0200

Kernel : latest drm-intel-nightly: 2015y-11m-06d-12h-48m-02s UTC integration
manifest
commit a3b0dec82fdb59c629c4fb9847245b80b0cf69dd
Author: Jani Nikula <jani.nikula at intel.com>
Date:   Fri Nov 6 14:48:23 2015 +0200

Additional notes : 
plug / unplug miniDP to VGA dongle (10 times) and the issue isn't present

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