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[smancke <1562076@xxxxxxxxxxxxxxxxxx>]

I have the same problem on my Levnovo T460s.
The same device worked with Ubuntu 15.10.

It is not always freezing, when I connect the HDMI, but approx. in 50% of the cases.
If I can help anything to support the analysis, let me know.

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https://bugs.launchpad.net/bugs/1562076

Title:
  Ubuntu freezes a few seconds after plugin a screen

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Hello,

  I'm running the latest beta of Ubuntu 16.04 Xenial on an ASUS UX303LA (Intel i5 6200U, Intel HD 520) and each time I plug a screen, using either HDMI or Mini DisplayPort, my laptop freezes after a few seconds.
  Alt + Function keys doesn't work, sound stops and I'm forced to shutdown the computer by long-pressing its Power button.

  I attached syslog, kern.log and Xorg.0.log for further information.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-15-generic 4.4.0-15.31
  ProcVersionSignature: Ubuntu 4.4.0-15.31-generic 4.4.6
  Uname: Linux 4.4.0-15-generic x86_64
  ApportVersion: 2.20-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  axel       1632 F.... pulseaudio
  CurrentDesktop: GNOME
  Date: Fri Mar 25 17:34:54 2016
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=2acdb9a2-2923-4550-9019-32e79d136c4d
  InstallationDate: Installed on 2016-02-25 (29 days ago)
  InstallationMedia: Ubuntu-GNOME 15.10 "Wily Werewolf" - Release amd64 (20151021)
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 002: ID 0bda:57cb Realtek Semiconductor Corp. 
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: ASUSTeK COMPUTER INC. UX303UA
  ProcEnviron:
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=fr_FR.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-15-generic.efi.signed root=UUID=de727ab1-db17-453b-a371-4a143f37dcad ro noprompt persistent quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-15-generic N/A
   linux-backports-modules-4.4.0-15-generic  N/A
   linux-firmware                            1.157
  SourcePackage: linux
  UpgradeStatus: Upgraded to xenial on 2016-02-25 (28 days ago)
  dmi.bios.date: 08/27/2015
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: UX303UA.202
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: UX303UA
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: ATN12345678901234567
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK COMPUTER INC.
  dmi.chassis.version: 1.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrUX303UA.202:bd08/27/2015:svnASUSTeKCOMPUTERINC.:pnUX303UA:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnUX303UA:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
  dmi.product.name: UX303UA
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK COMPUTER INC.

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