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[Shengjing Zhu <1586046@xxxxxxxxxxxxxxxxxx>]

upstream bug: https://bugs.freedesktop.org/show_bug.cgi?id=96214

** Bug watch added: freedesktop.org Bugzilla #96214
   https://bugs.freedesktop.org/show_bug.cgi?id=96214

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https://bugs.launchpad.net/bugs/1586046

Title:
  Unclaimed register detected after reading register 0x65f10

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  After booting to newest kernel, I see following in dmesg:

  [   28.156951] WARNING: CPU: 3 PID: 2005 at /build/linux-FvcHlK/linux-4.4.0/ubuntu/i915/intel_uncore.c:649 __unclaimed_reg_debug+0x80/0x90 [i915_bpo]()
  [   28.156953] Unclaimed register detected after reading register 0x65f10

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-22-generic 4.4.0-22.40
  ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8
  Uname: Linux 4.4.0-22-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/pcmC0D3p:   cromo      1941 F...m pulseaudio
   /dev/snd/controlC0:  cromo      1941 F.... pulseaudio
   /dev/snd/seq:        timidity   1020 F.... timidity
  Date: Thu May 26 09:46:38 2016
  HibernationDevice: RESUME=UUID=3cd6beac-9b2b-4af8-9004-fdec2b01f2df
  InstallationDate: Installed on 2013-04-24 (1128 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130423.1)
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 005: ID 0c45:670c Microdia 
   Bus 001 Device 004: ID 04f3:20d0 Elan Microelectronics Corp. 
   Bus 001 Device 003: ID 0a5c:6412 Broadcom Corp. 
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: Dell Inc. XPS 13 9350
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-22-generic root=UUID=50ed3eed-05f6-4dce-b5d6-86a6519d89c1 ro quiet splash i8042.nopnp
  PulseList:
   Error: command ['pacmd', 'list'] failed with exit code 1: XDG_RUNTIME_DIR (/run/user/1000) is not owned by us (uid 0), but by uid 1000! (This could e g happen if you try to connect to a non-root PulseAudio as a root user, over the native protocol. Don't do that.)
   No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-22-generic N/A
   linux-backports-modules-4.4.0-22-generic  N/A
   linux-firmware                            1.157
  SourcePackage: linux
  UpgradeStatus: Upgraded to xenial on 2016-03-23 (64 days ago)
  dmi.bios.date: 03/01/2016
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.3.3
  dmi.board.name: 0VM5NC
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvr1.3.3:bd03/01/2016:svnDellInc.:pnXPS139350:pvr:rvnDellInc.:rn0VM5NC:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.name: XPS 13 9350
  dmi.sys.vendor: Dell Inc.

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