knz, thank you for reporting this and helping make Ubuntu better.

To see if this is already resolved, could you please test
http://cdimage.ubuntu.com/daily-live/current/ and advise to the results?

** Tags added: bios-outdated-1.42

** Changed in: xorg (Ubuntu)
   Importance: Undecided => Low

** Changed in: xorg (Ubuntu)
       Status: New => Incomplete

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Touch seeded packages, which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1566759

Title:
  Full system lockup after attaching external monitor

Status in xorg package in Ubuntu:
  Incomplete

Bug description:
  Running on a recently acquired Lenovo Yoga 260.

  How to reproduce:
  1. plug external screen
  2. activate/configure monitor (either using GUI or xrandr)
  3. set relative position of ext monitor to something else than the default 
(e.g. above or below)
  4. move cursor from laptop screen to external screen
  5. move cursor back from extrernal screen to laptop screen

  At this point a full system freeze occurs. Cannot switch to console,
  no kernel error (crashkernel does not activate), no trace in
  dmesg/Xorg.log etc. Even remote ssh sessions onto the computer freeze,
  so no extra information can be gathered this way.

  The lock-up does not occur if any of the steps above are omitted:
  - no issue if the external monitor is not activated
  - no issue if the relative position is not changed
  - no issue if the mouse cursor stays on the laptop screen where it was 
initially
  - no issue if the mouse cursor iis moved from the laptop screen to the 
external screen and stays there

  **Also the issue does not occur if the external monitor is already
  plugged before boot, and the resolution and position is only set once
  upon Xorg start-up**.  In other words it is possible to use an
  external monitor as long as 1) it is plugged before boot 2) the Xorg
  conf contains explicit entries to set the resolution and position.

  The issue can be reproduced reliably on both a fresh 15.10 install,
  any stock Ubuntu kernel, and the mainline PPA kernels (up to and
  including the latest 4.6-rc2). Also reproduces reliably with both the
  base intel drivers shipped with 15.10 and those provided by Intel's
  linux-installer.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: xorg 1:7.7+7ubuntu4
  Uname: Linux 4.6.0-040600rc2-generic x86_64
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: None
  Date: Wed Apr  6 11:31:13 2016
  DistUpgraded: Fresh install
  DistroCodename: wily
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes
  GpuHangFrequency: Continuously
  GpuHangReproducibility: Yes, I can easily reproduce it
  GpuHangStarted: Since before I upgraded
  GraphicsCard:
   Intel Corporation Sky Lake Integrated Graphics [8086:1916] (rev 07) (prog-if 
00 [VGA controller])
     Subsystem: Lenovo Device [17aa:2237]
  InstallationDate: Installed on 2016-03-13 (23 days ago)
  InstallationMedia: Xubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  MachineType: LENOVO 20FD0004US
  ProcEnviron:
   TERM=screen
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/usr/bin/zsh
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.6.0-040600rc2-generic 
root=/dev/mapper/xubuntu--vg-root ro quiet splash intel_idle.max_cstate=1 
crashkernel=384M-:200M
  SourcePackage: xorg
  Symptom: display
  Title: Xorg freeze
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 11/05/2015
  dmi.bios.vendor: LENOVO
  dmi.bios.version: N1GET34W (1.11 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20FD0004US
  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:bvrN1GET34W(1.11):bd11/05/2015:svnLENOVO:pn20FD0004US:pvrThinkPadYoga260:rvnLENOVO:rn20FD0004US:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone:
  dmi.product.name: 20FD0004US
  dmi.product.version: ThinkPad Yoga 260
  dmi.sys.vendor: LENOVO
  version.compiz: compiz N/A
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.65+git20151026.c745e541-0ubuntu0ricotz~wily
  version.libgl1-mesa-dri: libgl1-mesa-dri 11.0.4-1intel1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 11.0.4-1intel1
  version.xserver-xorg-core: xserver-xorg-core 2:1.17.2-1ubuntu9.1
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.2-1ubuntu1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 
1:7.5.99+git20150521.d64a13eb-0ubuntu0ricotz
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20151202.da9ad388-0ubuntu0sarvatt
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:1.0.11+git20150926.1ff13a92-0ubuntu0sarvatt
  xserver.bootTime: Wed Apr  6 11:25:42 2016
  xserver.configfile: None
  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.17.2-1ubuntu9.1
  xserver.video_driver: intel

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