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[Bug 1570780] Re: External Monitor makes System with Ubuntu 15.10 and Intel Graphics freeze


As requested I installed the newest mainline kernel (uname -a reports: Linux knut-ThinkPad-L460 4.6.0-040600rc4-generic #201604172330 SMP Mon Apr 18 03:32:32 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux).
For the first time I could use two displays in extended desktop mode but after some moments the system froze again, now I'm using only the external monitor. Therefore I would say, there is little progress.
During installation of the rc4-kernel there were some issues, however installation finished with "erledigt", which is german and translates to "done". I copied the output and attach it here. In the next comment I'll add the log that should be consulted.
Then I tag this bug as requested with 'kernel-bug-exists-upstream' and 'Confirmed'.
As the notebook is new this was a fresh installation of Ubuntu 15.10 I cannot say, whether there are prior kernel versions without this bug.
Thanks for caring for my issue and tell me please if there are any additional information needed to address this.

** Attachment added: "output.log"

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  External Monitor makes System with Ubuntu 15.10 and Intel Graphics

Status in linux package in Ubuntu:

Bug description:
  A Lenovo ThinkPad L460 with Intel Graphics freezes, if an external
  Monitor is connected via the docking station.

  Please tell me if any information to solve this issue is needed.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: linux-image-4.2.0-35-generic 4.2.0-35.40
  ProcVersionSignature: Ubuntu 4.2.0-35.40-generic 4.2.8-ckt5
  Uname: Linux 4.2.0-35-generic x86_64
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
   /dev/snd/controlC0:  knut       1724 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Fri Apr 15 11:56:45 2016
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=3ed9dcc5-0917-4be8-a2df-82cc2f5f36ef
  InstallationDate: Installed on 2016-04-06 (9 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 004: ID 04f2:b541 Chicony Electronics Co., Ltd 
   Bus 001 Device 005: ID 8087:0a2b Intel Corp. 
   Bus 001 Device 002: ID 138a:0011 Validity Sensors, Inc. VFS5011 Fingerprint Reader
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: LENOVO 20FVS01500
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.2.0-35-generic root=UUID=b6aaa9e7-c690-41f8-a56b-dc0043e4cc20 ro quiet splash vt.handoff=7
   linux-restricted-modules-4.2.0-35-generic N/A
   linux-backports-modules-4.2.0-35-generic  N/A
   linux-firmware                            1.149.3
  SourcePackage: linux
  UdevLog: Error: [Errno 2] Datei oder Verzeichnis nicht gefunden: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 02/04/2016
  dmi.bios.vendor: LENOVO
  dmi.bios.version: R08ET35W (1.09 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20FVS01500
  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:bvrR08ET35W(1.09):bd02/04/2016:svnLENOVO:pn20FVS01500:pvrThinkPadL460:rvnLENOVO:rn20FVS01500:rvrNotDefined:cvnLENOVO:ct10:cvrNone:
  dmi.product.name: 20FVS01500
  dmi.product.version: ThinkPad L460
  dmi.sys.vendor: LENOVO

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