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[Akshay Bhat <1446008@xxxxxxxxxxxxxxxxxx>]

I dont think this started happening after an update/upgrade. It was
there in Ubuntu 3.16.0-33.44-generic (3.16.7-ckt7) as well. This is a
new laptop I got less than a month back, as far as I can tell its always
been there.

Log from previous kernel version with error:
https://launchpadlibrarian.net/202425253/BootDmesg.txt

Unfortunately I wont be able to test the mainline kernel for the next 2
weeks. I can give it a try after that.

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https://bugs.launchpad.net/bugs/1446008

Title:
  ivybridge_set_fifo_underrun_reporting errors

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  I periodically get these errors in the log:

  [852303.850395] [drm:ivybridge_set_fifo_underrun_reporting] *ERROR* uncleared fifo underrun on pipe B
  [852303.850399] [drm:ivb_err_int_handler] *ERROR* Pipe B FIFO underrun
  [854524.300634] [drm:cpt_set_fifo_underrun_reporting] *ERROR* uncleared pch fifo underrun on pch transcoder A
  [856131.510987] [drm:ivybridge_set_fifo_underrun_reporting] *ERROR* uncleared fifo underrun on pipe B
  [856131.510991] [drm:ivb_err_int_handler] *ERROR* Pipe B FIFO underrun

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: linux-image-3.16.0-34-generic 3.16.0-34.47
  ProcVersionSignature: Ubuntu 3.16.0-34.45-generic 3.16.7-ckt8
  Uname: Linux 3.16.0-34-generic x86_64
  ApportVersion: 2.14.7-0ubuntu8.4
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/pcmC1D0p:   nodeax     2631 F...m pulseaudio
   /dev/snd/controlC1:  nodeax     2631 F.... pulseaudio
   /dev/snd/controlC0:  nodeax     2631 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Sun Apr 19 17:00:25 2015
  HibernationDevice: RESUME=UUID=dfedd1c5-c595-4165-aa06-003b20f8cf19
  MachineType: System76, Inc. Gazelle Professional
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-34-generic root=UUID=fd2a1529-14bd-4e1d-bb45-13cd9cbe5651 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-34-generic N/A
   linux-backports-modules-3.16.0-34-generic  N/A
   linux-firmware                             1.138.1
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/28/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 1.03.06RS761
  dmi.board.asset.tag: Tag 12345
  dmi.board.name: Gazelle Professional
  dmi.board.vendor: System76, Inc.
  dmi.board.version: gazp9b
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 9
  dmi.chassis.vendor: System76, Inc.
  dmi.chassis.version: gazp9b
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1.03.06RS761:bd07/28/2014:svnSystem76,Inc.:pnGazelleProfessional:pvrgazp9b:rvnSystem76,Inc.:rnGazelleProfessional:rvrgazp9b:cvnSystem76,Inc.:ct9:cvrgazp9b:
  dmi.product.name: Gazelle Professional
  dmi.product.version: gazp9b
  dmi.sys.vendor: System76, Inc.

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