This happened after upgrade to 16.10 I believe (unfortunately I am not
100% sure about this). I can confirm that this is fixed using
4.9.2-040902-generic from mainline kernels.

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

** Tags added: kernel-fixed-upstream

** Description changed:

- I have a Lenovo X1 Carbon (4th gen) and using the Lenovo one-link+ docking 
station. The laptop is connected through the docking station to 2 external 
monitors when docked. When undocking the laptop, the laptop does not detect 
that the monitors have been disconnected (leaving X in a somewhat unworkable 
state). Even worse, when undocking with thelid closed (which would previously 
have resulted in suspend) the laptop now starts working hard and the fan starts 
spinning up (which is particularly bad when forgetting about this and placing 
the laptop in a bag). The laptop also becomes very unresponsive to X actions, 
e.g. xrandr --query takes a a couple of seconds, switching to the console takes 
> 10s. 
+ I have a Lenovo X1 Carbon (4th gen) and using the Lenovo one-link+ docking 
station. The laptop is connected through the docking station to 2 external 
monitors when docked. When undocking the laptop, the laptop does not detect 
that the monitors have been disconnected (leaving X in a somewhat unworkable 
state). Even worse, when undocking with thelid closed (which would previously 
have resulted in suspend) the laptop now starts working hard and the fan starts 
spinning up (which is particularly bad when forgetting about this and placing 
the laptop in a bag). The laptop also becomes very unresponsive to X actions, 
e.g. xrandr --query takes a a couple of seconds, switching to the console takes 
> 10s.
  This seems to be related to the following Fedora bug:
  https://bugzilla.redhat.com/show_bug.cgi?id=1392885
  which reports almost identical issues. I have not been able to try a new 
kernel yet to see if issues are fixed.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 16.10
  Package: linux-image-4.8.0-30-generic 4.8.0-30.32
  ProcVersionSignature: Ubuntu 4.8.0-30.32-generic 4.8.6
  Uname: Linux 4.8.0-30-generic x86_64
  ApportVersion: 2.20.3-0ubuntu8.2
  Architecture: amd64
  AudioDevicesInUse:
-  USER        PID ACCESS COMMAND
-  /dev/snd/controlC0:  jschrod    2726 F.... pulseaudio
+  USER        PID ACCESS COMMAND
+  /dev/snd/controlC0:  jschrod    2726 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Tue Jan 10 21:28:42 2017
  HibernationDevice: RESUME=UUID=de3940cc-d877-44b6-9b33-16a8abd6701c
  InstallationDate: Installed on 2016-10-01 (101 days ago)
  InstallationMedia: Ubuntu 16.10 "Yakkety Yak" - Alpha amd64 (20160922)
  Lsusb:
-  Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
-  Bus 001 Device 003: ID 13d3:5248 IMC Networks 
-  Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
+  Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
+  Bus 001 Device 003: ID 13d3:5248 IMC Networks
+  Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: LENOVO 20FB006AMS
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.8.0-30-generic.efi.signed 
root=UUID=a43e313c-5c49-4859-a1aa-4446f2b9c455 ro quiet splash
  RelatedPackageVersions:
-  linux-restricted-modules-4.8.0-30-generic N/A
-  linux-backports-modules-4.8.0-30-generic  N/A
-  linux-firmware                            1.161.1
+  linux-restricted-modules-4.8.0-30-generic N/A
+  linux-backports-modules-4.8.0-30-generic  N/A
+  linux-firmware                            1.161.1
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/02/2016
  dmi.bios.vendor: LENOVO
  dmi.bios.version: N1FET43W (1.17 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20FB006AMS
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0J40697 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: 
dmi:bvnLENOVO:bvrN1FET43W(1.17):bd08/02/2016:svnLENOVO:pn20FB006AMS:pvrThinkPadX1Carbon4th:rvnLENOVO:rn20FB006AMS:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone:
  dmi.product.name: 20FB006AMS
  dmi.product.version: ThinkPad X1 Carbon 4th
  dmi.sys.vendor: LENOVO

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https://bugs.launchpad.net/bugs/1655450

Title:
  monitors not disconnected after undocking

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  I have a Lenovo X1 Carbon (4th gen) and using the Lenovo one-link+ docking 
station. The laptop is connected through the docking station to 2 external 
monitors when docked. When undocking the laptop, the laptop does not detect 
that the monitors have been disconnected (leaving X in a somewhat unworkable 
state). Even worse, when undocking with thelid closed (which would previously 
have resulted in suspend) the laptop now starts working hard and the fan starts 
spinning up (which is particularly bad when forgetting about this and placing 
the laptop in a bag). The laptop also becomes very unresponsive to X actions, 
e.g. xrandr --query takes a a couple of seconds, switching to the console takes 
> 10s.
  This seems to be related to the following Fedora bug:
  https://bugzilla.redhat.com/show_bug.cgi?id=1392885
  which reports almost identical issues. I have not been able to try a new 
kernel yet to see if issues are fixed.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.10
  Package: linux-image-4.8.0-30-generic 4.8.0-30.32
  ProcVersionSignature: Ubuntu 4.8.0-30.32-generic 4.8.6
  Uname: Linux 4.8.0-30-generic x86_64
  ApportVersion: 2.20.3-0ubuntu8.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  jschrod    2726 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Tue Jan 10 21:28:42 2017
  HibernationDevice: RESUME=UUID=de3940cc-d877-44b6-9b33-16a8abd6701c
  InstallationDate: Installed on 2016-10-01 (101 days ago)
  InstallationMedia: Ubuntu 16.10 "Yakkety Yak" - Alpha amd64 (20160922)
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 003: ID 13d3:5248 IMC Networks
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: LENOVO 20FB006AMS
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.8.0-30-generic.efi.signed 
root=UUID=a43e313c-5c49-4859-a1aa-4446f2b9c455 ro quiet splash
  RelatedPackageVersions:
   linux-restricted-modules-4.8.0-30-generic N/A
   linux-backports-modules-4.8.0-30-generic  N/A
   linux-firmware                            1.161.1
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/02/2016
  dmi.bios.vendor: LENOVO
  dmi.bios.version: N1FET43W (1.17 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20FB006AMS
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0J40697 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: 
dmi:bvnLENOVO:bvrN1FET43W(1.17):bd08/02/2016:svnLENOVO:pn20FB006AMS:pvrThinkPadX1Carbon4th:rvnLENOVO:rn20FB006AMS:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone:
  dmi.product.name: 20FB006AMS
  dmi.product.version: ThinkPad X1 Carbon 4th
  dmi.sys.vendor: LENOVO

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