Public bug reported:

What I do:
Lenovo x250 is connected to Lenovo dock where an additional monitor is 
connected. I only use the external.
Then I close the lid, take the laptop off the dock and use it a few minutes 
later just fine.
Then I return back home, connect the laptop to the dock again with closed lid. 
I press the dock's power button to wake it up. External monitor does not react.
When I open the lid, the internal monitor is on, I can not switch to the 
external monitor in system settings, it is not detected in "xrandr --query".

Ubuntu 16.04.1
xorg: 1:7.7+13ubuntu3

Would be nice if you guys can help. Thanks.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: xorg 1:7.7+13ubuntu3
ProcVersionSignature: Ubuntu 4.4.0-28.47-generic 4.4.13
Uname: Linux 4.4.0-28-generic x86_64
.tmp.unity_support_test.0:
 
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
BootLog: [    9.228976] rc.local[1043]:  * Starting crypto disk...
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: Fri Jul 22 14:23:04 2016
DistUpgraded: Fresh install
DistroCodename: xenial
DistroVariant: ubuntu
DkmsStatus:
 virtualbox, 5.0.24, 4.4.0-28-generic, x86_64: installed
 virtualbox, 5.0.24, 4.4.0-31-generic, x86_64: installed
EcryptfsInUse: Yes
ExtraDebuggingInterest: Yes, if not too technical
GraphicsCard:
 Intel Corporation Broadwell-U Integrated Graphics [8086:1616] (rev 09) 
(prog-if 00 [VGA controller])
   Subsystem: Lenovo Broadwell-U Integrated Graphics [17aa:2226]
InstallationDate: Installed on 2016-05-24 (59 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
MachineType: LENOVO 20CLS41500
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-28-generic 
root=UUID=9f9a0e4b-b36a-456a-be5e-e5e00a4d1a0b ro quiet splash
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 02/26/2016
dmi.bios.vendor: LENOVO
dmi.bios.version: N10ET42W (1.21 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20CLS41500
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:bvrN10ET42W(1.21):bd02/26/2016:svnLENOVO:pn20CLS41500:pvrThinkPadX250:rvnLENOVO:rn20CLS41500:rvrNotDefined:cvnLENOVO:ct10:cvrNone:
dmi.product.name: 20CLS41500
dmi.product.version: ThinkPad X250
dmi.sys.vendor: LENOVO
version.compiz: compiz 1:0.9.12.2+16.04.20160714-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.67-1ubuntu0.16.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri 11.2.0-1ubuntu2
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 11.2.0-1ubuntu2
version.xserver-xorg-core: xserver-xorg-core 2:1.18.3-1ubuntu2.2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20160325-1ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-1build2
xserver.bootTime: Mon Jul 18 21:16:45 2016
xserver.configfile: default
xserver.errors:
 
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id                                1079 
 vendor                                     LGD
xserver.version: 2:1.18.3-1ubuntu2.2

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug compiz-0.9 ubuntu xenial

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You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1605618

Title:
  Monitor on Lenovo dock not detected after Suspend

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