I primarily observe this issue when manually turning on my monitor after
unlock, after it fails to autowake. The problem appears to occur at  Apr
11 09:08:41 in the attached kern.log.

Running on Ubuntu 16.04

/proc/version:
Linux version 4.13.0-36-generic (buildd@lgw01-amd64-033) (gcc version 5.4.0 
20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.9)) #40~16.04.1-Ubuntu SMP Fri Feb 16 
23:25:58 UTC 2018

/proc/cpuinfo attached


** Attachment added: "cpuinfo"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1727662/+attachment/5110430/+files/cpuinfo

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https://bugs.launchpad.net/bugs/1727662

Title:
  [Lenovo ThinkPad T450s] Issues after docking and locking:
  [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A
  FIFO underrun

Status in Linux:
  Incomplete
Status in linux package in Ubuntu:
  Triaged

Bug description:
  What happens is after I dock my laptop into a Lenovo ThinkPad Ultra Dock Type 
40A2 20V, lock it via clicking the lock icon, and wait ~30 minutes, one of the 
following three things happen ~50% of the time when I come back to unlock it:
  * Most of the time the computer is found shut down.
  * Sometimes the notebook screen flickers weirdly and one of the two external 
monitors show pixelation.
  * The notebook screen shows the lock screen but is completely frozen. 
Occasionally unlocking works.

  I have two external monitors attached to the docking station.

  When I dock my laptop, the battery indicator does recognize its
  charging.

  I've not seen this issue when:
  1) With the laptop in the dock, while actively using the laptop.
  2) With the laptop out of the dock and no external monitors present.

  This bug started after upgrading from Ubtuntu 17.04 to Ubuntu 17.10.

  Using or not using the following kernel parameter didn't change anything:
  i915.enable_rc6=0

  Updated docking station firmware to latest 2.33.00.

  PC temperatures are normal as per lm-sensors.

  20171109 - Not reproducible testing drm-tip for 1.5 days.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-16-lowlatency 4.13.0-16.19
  ProcVersionSignature: Ubuntu 4.13.0-16.19-lowlatency 4.13.4
  Uname: Linux 4.13.0-16-lowlatency x86_64
  ApportVersion: 2.20.7-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  akops      3337 F.... pulseaudio
   /dev/snd/controlC0:  akops      3337 F.... pulseaudio
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Oct 26 10:44:11 2017
  HibernationDevice: RESUME=/dev/mapper/system-swap_1
  MachineType: LENOVO 20BWS2YL00
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.13.0-16-lowlatency 
root=/dev/mapper/system-root ro quiet splash i915.enable_rc6=0 
crashkernel=384M-:128M vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.13.0-16-lowlatency N/A
   linux-backports-modules-4.13.0-16-lowlatency  N/A
   linux-firmware                                1.169
  SourcePackage: linux
  UpgradeStatus: Upgraded to artful on 2017-10-20 (5 days ago)
  dmi.bios.date: 07/08/2015
  dmi.bios.vendor: LENOVO
  dmi.bios.version: JBET51WW (1.16 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20BWS2YL00
  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:bvrJBET51WW(1.16):bd07/08/2015:svnLENOVO:pn20BWS2YL00:pvrThinkPadT450s:rvnLENOVO:rn20BWS2YL00:rvrSDK0E50510WIN:cvnLENOVO:ct10:cvrNone:
  dmi.product.family: ThinkPad T450s
  dmi.product.name: 20BWS2YL00
  dmi.product.version: ThinkPad T450s
  dmi.sys.vendor: LENOVO

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