Sergey Menshikov, it is most helpful if you use the computer the problem is 
reproducible with, and file a new report with Ubuntu via a terminal:
ubuntu-bug linux

Please feel free to subscribe me to it.

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to xserver-xorg-video-intel in Ubuntu.
https://bugs.launchpad.net/bugs/1552040

Title:
  [Lenovo ThinkPad T440s] Laptop sometimes doesn't detect external
  monitor

Status in xserver-xorg-video-intel package in Ubuntu:
  Incomplete

Bug description:
  Usually a reboot fixes the problem. I see stuff like this in dmesg.

  [15294.887642] [drm:intel_wait_ddi_buf_idle [i915]] *ERROR* Timeout waiting 
for DDI BUF C idle bit
  [15295.568309] [drm:intel_dp_link_training_clock_recovery [i915]] *ERROR* too 
many voltage retries, give up
  [15295.587193] [drm:intel_wait_ddi_buf_idle [i915]] *ERROR* Timeout waiting 
for DDI BUF C idle bit
  [15296.267547] [drm:intel_dp_link_training_clock_recovery [i915]] *ERROR* too 
many voltage retries, give up
  [15296.286426] [drm:intel_wait_ddi_buf_idle [i915]] *ERROR* Timeout waiting 
for DDI BUF C idle bit
  [15296.886015] [drm:intel_dp_link_training_clock_recovery [i915]] *ERROR* too 
many voltage retries, give up
  [15296.886264] [drm:intel_dp_link_training_channel_equalization [i915]] 
*ERROR* failed to train DP, aborting
  [15296.898472] [drm:intel_dp_link_training_channel_equalization [i915]] 
*ERROR* Timed out waiting for DP idle patterns
  [15296.899688] [drm:intel_wait_ddi_buf_idle [i915]] *ERROR* Timeout waiting 
for DDI BUF C idle bit
  [15297.579305] [drm:intel_dp_link_training_clock_recovery [i915]] *ERROR* too 
many voltage retries, give up
  [15297.598328] [drm:intel_wait_ddi_buf_idle [i915]] *ERROR* Timeout waiting 
for DDI BUF C idle bit
  [15298.279238] [drm:intel_dp_link_training_clock_recovery [i915]] *ERROR* too 
many voltage retries, give up
  [15298.298275] [drm:intel_wait_ddi_buf_idle [i915]] *ERROR* Timeout waiting 
for DDI BUF C idle bit
  [15298.965500] [drm:intel_dp_link_training_clock_recovery [i915]] *ERROR* too 
many voltage retries, give up
  [15298.984539] [drm:intel_wait_ddi_buf_idle [i915]] *ERROR* Timeout waiting 
for DDI BUF C idle bit
  [15299.665619] [drm:intel_dp_link_training_clock_recovery [i915]] *ERROR* too 
many voltage retries, give up
  [15299.684522] [drm:intel_wait_ddi_buf_idle [i915]] *ERROR* Timeout waiting 
for DDI BUF C idle bit
  [15300.367119] [drm:intel_dp_link_training_clock_recovery [i915]] *ERROR* too 
many voltage retries, give up
  [15300.386173] [drm:intel_wait_ddi_buf_idle [i915]] *ERROR* Timeout waiting 
for DDI BUF C idle bit
  [15301.067203] [drm:intel_dp_link_training_clock_recovery [i915]] *ERROR* too 
many voltage retries, give up
  [15301.086097] [drm:intel_wait_ddi_buf_idle [i915]] *ERROR* Timeout waiting 
for DDI BUF C idle bit
  [15301.768998] [drm:intel_dp_link_training_clock_recovery [i915]] *ERROR* too 
many voltage retries, give up
  [15301.769703] [drm:intel_dp_link_training_channel_equalization [i915]] 
*ERROR* failed to train DP, aborting
  [15301.781947] [drm:intel_dp_link_training_channel_equalization [i915]] 
*ERROR* Timed out waiting for DP idle patterns

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: xserver-xorg-video-intel 2:2.99.917+git20160218-1ubuntu2
  ProcVersionSignature: Ubuntu 4.4.0-8.23-generic 4.4.2
  Uname: Linux 4.4.0-8-generic x86_64
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.20-0ubuntu3
  Architecture: amd64
  BootLog: [  OK  ] Started LSB: Speech Dispatcher.
  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 Mar  1 20:58:27 2016
  DistUpgraded: Fresh install
  DistroCodename: xenial
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes, including running git bisection searches
  GraphicsCard:
   Intel Corporation Haswell-ULT Integrated Graphics Controller [8086:0a16] 
(rev 09) (prog-if 00 [VGA controller])
     Subsystem: Lenovo Haswell-ULT Integrated Graphics Controller [17aa:220c]
  InstallationDate: Installed on 2016-02-26 (5 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160224)
  MachineType: LENOVO 20AQS00500
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-8-generic 
root=UUID=bb8da1f1-8970-435e-aeaf-d7e1d9aa8a4e ro quiet splash vt.handoff=7
  SourcePackage: xserver-xorg-video-intel
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 09/21/2015
  dmi.bios.vendor: LENOVO
  dmi.bios.version: GJET85WW (2.35 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20AQS00500
  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: Not Available
  dmi.modalias: 
dmi:bvnLENOVO:bvrGJET85WW(2.35):bd09/21/2015:svnLENOVO:pn20AQS00500:pvrThinkPadT440s:rvnLENOVO:rn20AQS00500:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 20AQS00500
  dmi.product.version: ThinkPad T440s
  dmi.sys.vendor: LENOVO
  version.compiz: compiz 1:0.9.12.2+16.04.20160209-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.67-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 11.1.2-1ubuntu1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 11.1.2-1ubuntu1
  version.xserver-xorg-core: xserver-xorg-core 2:1.17.3-2ubuntu4
  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+git20160218-1ubuntu2
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-1
  xserver.bootTime: Tue Mar  1 12:11:39 2016
  xserver.configfile: default
  xserver.errors: systemd-logind: failed to get session: PID 832 does not 
belong to any known session
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                               12350 
   vendor                                     AUO
  xserver.version: 2:1.17.3-2ubuntu4

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