[Bug 94766] New: Segfault and other crashes on Intel(R) HD Graphics 5500 (Dell E7450) while switching between external displays and integreated

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94766

            Bug ID: 94766
           Summary: Segfault and other crashes on Intel(R) HD Graphics
                    5500 (Dell E7450) while switching between external
                    displays and integreated
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: slawek at otwiera.cz
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 122642
  --> https://bugs.freedesktop.org/attachment.cgi?id=122642&action=edit
Previous boot dmesg: journalctl -k -b -1

This happens randomly - I have no 100% reproducible way of doing this. I am
suffering random problems when docking/undocking with (and simple script
reacting on udev changes to execute specific xrandr commands, just --output
--left-of and like that).

There've been actually three issues:
1) All displays black after docked or undock (this was last reproduced on
kernel 4.4.5, not testing 4.4.6 and following issues 2 and 3 were already
reproduced)
   Original bug report: https://bugzilla.kernel.org/show_bug.cgi?id=115511
   Copy'n'paste:
   * Facts
   ** Video freezes from time to time (randomly) after Dell E7450 being plugged
into docking station with two external FHD displays attached (DP1-1 and DP1-2
in xrandr).
   ** I've got background shell script running which detects udev change and
calls xrandr to enable two external displays - so this issue might happend
after xrandr command or after plug-event itself (not really able to verify, it
will be difficult to work without it running)
   ** I was hitting shutdown button after crash, so there might be
shutdown-related events in log (at the end, I've hold it until system halted)
   * Guesses
   ** According to LEDs (not tested with SSH yet)  system is responding
normally after video freeze - disk LED blinks from time to time.
   ** One of external monitors might be already reading „empty signal” (if I
understand correctly, it is no longer reporting that there is no signal, but
instead it acts like there is perfectly black image displayed)
   * Attachments
   ** dmesg log from the crashed boot.

2) Laptop plugged out of docking station become unresponsive
   * Black screen
   * Unable to shutdown with short-powerbutton-press (what normally works).
   * Had to hold power button for hard shutdown.
   * Unfortunately, no logfile here.

3) Segfault when plugging into docking station
   * Plugged into docking station, saw login manager screen on external
displays (X crashed and restarted into SLIM)
   * Xorg.0.log attached


Some specs:

[otwieracz at odyssey:~]$ uname -a
Linux odyssey 4.4.6 #1-NixOS SMP Wed Mar 16 15:43:17 UTC 2016 x86_64 GNU/Linux

[otwieracz at odyssey:~]$ X -version

X.Org X Server 1.17.4
Release Date: 2015-10-28
X Protocol Version 11, Revision 0
Build Operating System: Linux 3.14.54 x86_64 
Current Operating System: Linux odyssey 4.4.6 #1-NixOS SMP Wed Mar 16 15:43:17
UTC 2016 x86_64
Kernel command line:
initrd=\efi\nixos\zzdi7fgmpik03vpl9l6699q1ggdgj7hr-initrd-initrd.efi
systemConfig=/nix/store/f6abzlbdj2i5j2lv631wpd109n8bn996-nixos-system-odyssey-16.09.git.32b7b00
init=/nix/store/f6abzlbdj2i5j2lv631wpd109n8bn996-nixos-system-odyssey-16.09.git.32b7b00/init
loglevel=4
Build Date: 24 March 2016  05:38:17PM

Current version of pixman: 0.34.0
        Before reporting problems, check http://wiki.x.org
        to make sure that you have the latest version.

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