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[Doug Gale <doug16k@xxxxxxxxx>]

Oh, my stress test is http://jsfiddle.net/GzSWJ/123/show/
it reliably caused i915 gpu hangs for me before upgrading to 15.04.

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https://bugs.launchpad.net/bugs/1449893

Title:
  i915 dmesg spam and poor battery life

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Since upgrading my i915 lockups are fixed (yay!) but now I have poor
  battery life and I get a lot of spam in dmesg:

  WARN_ON(!power_well->count)  at
  /build/buildd/linux-3.19.0/drivers/gpu/drm/i915/intel_runtime_pm.c:680
  intel_display_power_put+0x103/0x170 [i915]()

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-image-3.19.0-15-generic 3.19.0-15.15
  ProcVersionSignature: Ubuntu 3.19.0-15.15-generic 3.19.3
  Uname: Linux 3.19.0-15-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.17.2-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  doug       1868 F.... pulseaudio
   /dev/snd/controlC0:  doug       1868 F.... pulseaudio
  Date: Wed Apr 29 03:23:53 2015
  HibernationDevice: RESUME=UUID=7048b86e-1bcb-41e3-900d-d8453f419503
  InstallationDate: Installed on 2014-12-31 (118 days ago)
  InstallationMedia: Lubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
  MachineType: LENOVO 20238
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-15-generic.efi.signed root=UUID=a5b6eaae-04b1-418f-9b9a-5b3f1450bb8b ro
  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-3.19.0-15-generic N/A
   linux-backports-modules-3.19.0-15-generic  N/A
   linux-firmware                             1.143
  SourcePackage: linux
  UpgradeStatus: Upgraded to vivid on 2015-04-25 (4 days ago)
  dmi.bios.date: 10/20/2014
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 79CN50WW(V3.09)
  dmi.board.asset.tag: No Asset Tag
  dmi.board.name: INVALID
  dmi.board.vendor: LENOVO
  dmi.board.version: 31900058Std
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Lenovo G510
  dmi.modalias: dmi:bvnLENOVO:bvr79CN50WW(V3.09):bd10/20/2014:svnLENOVO:pn20238:pvrLenovoG510:rvnLENOVO:rnINVALID:rvr31900058Std:cvnLENOVO:ct10:cvrLenovoG510:
  dmi.product.name: 20238
  dmi.product.version: Lenovo G510
  dmi.sys.vendor: LENOVO

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