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[Doug Gale <doug16k@xxxxxxxxx>]

I installed the packages (needed headers too), rebooted into and
selected that version in grub, and so far it is passing my stress test
that provokes gpu hangs, and no hang yet, which is great!

Also, I haven't seen the warning yet (the ones I originally reported),
but that happens durng normal operation and may never happen during
stress.

I'll use it normally for a bit and report what happens.

Thanks!

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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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