[Bug 98371] New: Intel Corporation HD Graphics 5500 - Dell Latitude E5550 hangs after un- and redocking when switching to tty

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98371

            Bug ID: 98371
           Summary: Intel Corporation HD Graphics 5500 - Dell Latitude
                    E5550 hangs after un- and redocking when switching to
                    tty
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: maxmusterm at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

he machine I'm using is a "Dell Latitude E5550" and when you detach the
notebook from the docking station while running X (in my test case with 2
monitors connected) and reattaching it afterwards you can't switch to the tty
(ctrl+alt+fn) without freezing your pc. In this state it is still accessible
via ssh, but the only (known) "solution" for getting a working X again is to
reboot the system.
I'm running Arch Linux with 4.7.5, but is reproduce-able in older revisions as
well (Linux version 4.7.5-1-ARCH (builduser at tobias) (gcc version 6.2.1 20160830
(GCC) ) #1 SMP PREEMPT Sat Sep 24 13:04:22 CEST 2016).
The journalctl -k output from the last crash on 4.7.5 only showed
> BUG: unable to handle kernel NULL pointer dereference at           (null)
> IP: [<ffffffff815d4ad4>] __ww_mutex_lock_slowpath+0xd4/0x210
at the end so I will include a full dmesg output of the last crash on the 4.7.4
kernel as well. 
The X server version is 1.18.4 (like above reproduce-able in other versions)
and I'm using the modesetting driver instead of the intel xorg driver (but
again reproduce-able with both drivers).
Here is the full lspci output

00:00.0 Host bridge: Intel Corporation Broadwell-U Host Bridge -OPI (rev 09)
00:02.0 VGA compatible controller: Intel Corporation HD Graphics 5500 (rev 09)
00:03.0 Audio device: Intel Corporation Broadwell-U Audio Controller (rev 09)
00:04.0 Signal processing controller: Intel Corporation Broadwell-U Processor
Thermal Subsystem (rev 09)
00:14.0 USB controller: Intel Corporation Wildcat Point-LP USB xHCI Controller
(rev 03)
00:16.0 Communication controller: Intel Corporation Wildcat Point-LP MEI
Controller #1 (rev 03)
00:19.0 Ethernet controller: Intel Corporation Ethernet Connection (3) I218-LM
(rev 03)
00:1b.0 Audio device: Intel Corporation Wildcat Point-LP High Definition Audio
Controller (rev 03)
00:1c.0 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port #1
(rev e3)
00:1c.3 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port #4
(rev e3)
00:1c.4 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port #5
(rev e3)
00:1d.0 USB controller: Intel Corporation Wildcat Point-LP USB EHCI Controller
(rev 03)
00:1f.0 ISA bridge: Intel Corporation Wildcat Point-LP LPC Controller (rev 03)
00:1f.2 SATA controller: Intel Corporation Wildcat Point-LP SATA Controller
[AHCI Mode] (rev 03)
00:1f.3 SMBus: Intel Corporation Wildcat Point-LP SMBus Controller (rev 03)
01:00.0 SD Host controller: O2 Micro, Inc. SD/MMC Card Reader Controller (rev
01)
02:00.0 Network controller: Intel Corporation Wireless 7265 (rev 59)
03:00.0 3D controller: NVIDIA Corporation GM108M [GeForce 840M] (rev a2)

And I will gladly add any wished additional output.

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