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["Simon P." <1552906@xxxxxxxxxxxxxxxxxx>]

There also is a kernel bug report about this problem:
https://bugzilla.kernel.org/show_bug.cgi?id=113551

When setting intel_pstate=no_hwp as a kernel option like described
there, the problem does not occur any more on my X260.

** Bug watch added: Linux Kernel Bug Tracker #113551
   http://bugzilla.kernel.org/show_bug.cgi?id=113551

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https://bugs.launchpad.net/bugs/1552906

Title:
  System freezes after closing lid on Thinkpad X260

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  My current Ubuntu version is 14.04.4 but I also tried 15.10.
  Regardless of the Ubuntu version there is a serious problem with my new Thinkpad X260 when it is in battery mode and I close and reopen the lid. The problem is not affecting the suspend mode as it still occurs when this mode is disabled.

  what I expect to happen: After closing the lid the screen goes off.
  When I open the lid again, screen goes on and I can use the laptop.

  what happens every time: When I close the lid the screen turns black.
  When I open the lid again the screen displays the system but it is
  frozen and does not react on input.

  Interestingly I can not reproduce this problem when the laptop is connected to an AC power source.
  --- 
  ApportVersion: 2.14.1-0ubuntu3.19
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  simon      1437 F.... pulseaudio
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 14.04
  HibernationDevice: RESUME=UUID=76bcd0ad-fc42-4d1a-8089-0f10d23df682
  InstallationDate: Installed on 2016-03-03 (0 days ago)
  InstallationMedia: Ubuntu 14.04.4 LTS "Trusty Tahr" - Release amd64 (20160217.1)
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 004: ID 138a:0017 Validity Sensors, Inc. 
   Bus 001 Device 003: ID 04ca:7058 Lite-On Technology Corp. 
   Bus 001 Device 005: ID 8087:0a2b Intel Corp. 
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: LENOVO 20F5S0EU00
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-27-generic.efi.signed root=UUID=fa7f6b64-3d57-43ce-a52b-5323c46dd0ca ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 4.2.0-27.32~14.04.1-generic 4.2.8-ckt1
  RelatedPackageVersions:
   linux-restricted-modules-4.2.0-27-generic N/A
   linux-backports-modules-4.2.0-27-generic  N/A
   linux-firmware                            1.127.20
  Tags:  trusty
  Uname: Linux 4.2.0-27-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 01/25/2016
  dmi.bios.vendor: LENOVO
  dmi.bios.version: R02ET44W (1.17 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20F5S0EU00
  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:bvrR02ET44W(1.17):bd01/25/2016:svnLENOVO:pn20F5S0EU00:pvrThinkPadX260:rvnLENOVO:rn20F5S0EU00:rvrNotDefined:cvnLENOVO:ct10:cvrNone:
  dmi.product.name: 20F5S0EU00
  dmi.product.version: ThinkPad X260
  dmi.sys.vendor: LENOVO

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