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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

This issue appears to be an upstream bug, since you tested the latest
upstream kernel. Would it be possible for you to open an upstream bug
report[0]? That will allow the upstream Developers to examine the issue,
and may provide a quicker resolution to the bug.

Please follow the instructions on the wiki page[0]. The first step is to
email the appropriate mailing list. If no response is received, then a
bug may be opened on bugzilla.kernel.org.

Once this bug is reported upstream, please add the tag: 'kernel-bug-
reported-upstream'.

[0] https://wiki.ubuntu.com/Bugs/Upstream/kernel

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https://bugs.launchpad.net/bugs/1211394

Title:
  ThinkPad X201 external screen might blank when connected over
  displayport.

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  [   28.560855] Pid: 1422, comm: modprobe Tainted: PF          O 3.8.0-27-generic #40-Ubuntu
  [   28.560855] Call Trace:
  [   28.560861]  [<ffffffff810587ef>] warn_slowpath_common+0x7f/0xc0
  [   28.560863]  [<ffffffff810588ec>] warn_slowpath_fmt+0x4c/0x50
  [   28.560875]  [<ffffffffa07bd182>] intel_wait_for_pipe_off+0xe2/0x1a0 [i915]
  [   28.560886]  [<ffffffffa07bd376>] intel_disable_pipe+0x136/0x170 [i915]

  I'm having this issue on both precise and raring on ThinkPad X201.
  This issue only appears when external display attached to DisplayPort.

  The behavior is consistent with stock/mainline kernel with stock or
  intel linuxgraphics drivers (3.8.0-26-generic, 3.8.0-27-generic,
  3.8.0-27-generic with intel linux-graphics 2013Q2,
  3.10.0-997-generic,3.10.0-997-generic with intel linux-graphics
  2013Q2).

  External display works perfectly on VGA port.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: linux-image-3.8.0-27-generic 3.8.0-27.40
  ProcVersionSignature: Ubuntu 3.8.0-27.40-generic 3.8.13.4
  Uname: Linux 3.8.0-27-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl zcommon znvpair
  ApportVersion: 2.9.2-0ubuntu8.3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  coyang     5192 F.... pulseaudio
  Date: Tue Aug 13 00:09:38 2013
  HibernationDevice: RESUME=UUID=a5e3bbe9-32c8-45b5-bb80-7992a11ee933
  InstallationDate: Installed on 2010-11-08 (1008 days ago)
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
  MachineType: LENOVO 3680N48
  MarkForUpload: True
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: boot=zfs bootfs=rpool/ROOT/raring clocksource=acpi_pm noapic usbcore.autosuspend=1 nmi_watchdog=0 processor.ignore_ppc=1 enable_mtrr_cleanup mtrr_spare_reg_nr=1 pciehp.pciehp_force=1 i915.semaphores=1
  PulseList:
   Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied
   No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-3.8.0-27-generic N/A
   linux-backports-modules-3.8.0-27-generic  N/A
   linux-firmware                            1.106
  SourcePackage: linux
  UpgradeStatus: Upgraded to raring on 2011-10-10 (672 days ago)
  WifiSyslog:
   Aug 13 00:09:32 coyang kernel: [  905.922614] type=1400 audit(1376323772.402:88): apparmor="ALLOWED" operation="open" parent=10533 profile="/opt/google/chrome/google-chrome//chrome_sandbox" name="/sys/devices/system/cpu/online" pid=10537 comm="nacl_helper_boo" requested_mask="r" denied_mask="r" fsuid=1001 ouid=0
   Aug 13 00:14:41 coyang NetworkManager[3222]: <warn> nl_recvmsgs() error: (-33) Dump inconsistency detected, interrupted
  dmi.bios.date: 10/11/2012
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 6QET70WW (1.40 )
  dmi.board.name: 3680N48
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvr6QET70WW(1.40):bd10/11/2012:svnLENOVO:pn3680N48:pvrThinkPadX201:rvnLENOVO:rn3680N48:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 3680N48
  dmi.product.version: ThinkPad X201
  dmi.sys.vendor: LENOVO

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