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[Bug 1592923] Status changed to Confirmed


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** Changed in: linux (Ubuntu)
       Status: New => Confirmed

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  Display artificats when using external display with Ubuntu 16.04 on
  Lenovo X1 Carbon (Broadwell)

Status in linux package in Ubuntu:

Bug description:
  After upgrading this laptop from 14.04 (LTS-Wily X & Kernel stack) to 16.04, I am no longer able to use external displays.  There are artifcacts on display that get worse with mouse movement.  Upgrading to a 4.7rc3 mainline kernel from the Ubuntu kernel PPA fixed the problem.
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
   /dev/snd/controlC1:  helen      2118 F.... pulseaudio
   /dev/snd/controlC0:  helen      2118 F.... pulseaudio
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 16.04
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2016-04-22 (54 days ago)
  InstallationMedia: Ubuntu 14.04.4 LTS "Trusty Tahr" - Release amd64 (20160217.1)
  MachineType: LENOVO 20BS0061ZA
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-25-generic.efi.signed root=UUID=fc75b093-6f8c-4b7e-946c-71df6814ab6a ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 4.4.0-25.44-generic 4.4.13
   linux-restricted-modules-4.4.0-25-generic N/A
   linux-backports-modules-4.4.0-25-generic  N/A
   linux-firmware                            1.157
  Tags:  xenial
  Uname: Linux 4.4.0-25-generic x86_64
  UpgradeStatus: Upgraded to xenial on 2016-06-14 (1 days ago)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 08/13/2015
  dmi.bios.vendor: LENOVO
  dmi.bios.version: N14ET32W (1.10 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20BS0061ZA
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0E50510 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: dmi:bvnLENOVO:bvrN14ET32W(1.10):bd08/13/2015:svnLENOVO:pn20BS0061ZA:pvrThinkPadX1Carbon3rd:rvnLENOVO:rn20BS0061ZA:rvrSDK0E50510WIN:cvnLENOVO:ct10:cvrNone:
  dmi.product.name: 20BS0061ZA
  dmi.product.version: ThinkPad X1 Carbon 3rd
  dmi.sys.vendor: LENOVO

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