Comment 0 for bug 1540953

I have a Lenovo T450s. When undocking the notebook from the docking station (Lenovo ProDock, two monitors are connected), Xorg frequently crashes.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: xorg 1:7.7+12ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-2.16-generic 4.4.0
Uname: Linux 4.4.0-2-generic x86_64
.tmp.unity.support.test.0:

ApportVersion: 2.19.4-0ubuntu2
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CurrentDesktop: Unity
Date: Tue Feb 2 15:43:35 2016
DistUpgraded: Fresh install
DistroCodename: xenial
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, including running git bisection searches
GraphicsCard:
 Intel Corporation Broadwell-U Integrated Graphics [8086:1616] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: Lenovo Device [17aa:5036]
InstallationDate: Installed on 2016-02-02 (0 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160131)
MachineType: LENOVO 20BWS00V00
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-2-generic root=UUID=eb42241b-c617-430d-84eb-b21a749fc2ff ro quiet splash vt.handoff=7
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/08/2015
dmi.bios.vendor: LENOVO
dmi.bios.version: JBET51WW (1.16 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20BWS00V00
dmi.board.vendor: LENOVO
dmi.board.version: Not Defined
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias: dmi:bvnLENOVO:bvrJBET51WW(1.16):bd07/08/2015:svnLENOVO:pn20BWS00V00:pvrThinkPadT450s:rvnLENOVO:rn20BWS00V00:rvrNotDefined:cvnLENOVO:ct10:cvrNone:
dmi.product.name: 20BWS00V00
dmi.product.version: ThinkPad T450s
dmi.sys.vendor: LENOVO
version.compiz: compiz 1:0.9.12.2+16.04.20151211-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.66-2
version.libgl1-mesa-dri: libgl1-mesa-dri 11.1.1-1ubuntu2
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 11.1.1-1ubuntu2
version.xserver-xorg-core: xserver-xorg-core 2:1.17.3-2ubuntu2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.2-1ubuntu1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.6.1-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20151217-1~exp1ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-1
xserver.bootTime: Tue Feb 2 15:33:03 2016
xserver.configfile: default
xserver.errors:
 systemd-logind: failed to get session: PID 3028 does not belong to any known session
 intel(0): sna_mode_shutdown_crtc: invalid state found on pipe 1, disabling CRTC:25
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id 4925
 vendor AUO
xserver.version: 2:1.17.3-2ubuntu2