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["Jamin W. Collins" <jcollins@xxxxxxxxxxxxxxxx>]

If someone can point me to steps for bisecting the changes between the
3.8 and 3.11 kernels, I'd be happy to do the leg work.

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https://bugs.launchpad.net/bugs/1247967

Title:
  nvidia optimus chipset disabled when running on battery, even in
  discrete mode

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  It appears that under 3.11.0-13, the Nvidia Optimus GPU is disabled
  when running on battery even if the chipset is set to discrete mode in
  the BIOS.

  When running without AC power under the 3.11 kernel, lspci -v gives the following:
  http://paste.ubuntu.com/6360607/

  With AC power under 3.11, the same command gives:
  http://paste.ubuntu.com/6360613/

  If the system is booted into the 3.11 kernel with AC power connected,
  it can be removed and the GPU continues to function normally.  I have
  not tested suspend and resume under the 3.11 kernel (with or without
  AC power).

  This same configuration worked properly under Raring (13.04).  Booting
  with the 3.8 kernel and the same nvidia module version used in the
  above 3.11 kernel tests results in the previously experienced
  (correct, working) behavior.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: linux-image-3.11.0-13-generic 3.11.0-13.20
  ProcVersionSignature: Ubuntu 3.8.0-32.47-generic 3.8.13.10
  Uname: Linux 3.8.0-32-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.12.5-0ubuntu2.1
  Architecture: amd64
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/dsp', '/dev/snd/controlC1', '/dev/snd/hwC1D0', '/dev/snd/pcmC1D3p', '/dev/snd/pcmC1D7p', '/dev/snd/pcmC1D8p', '/dev/snd/by-path', '/dev/snd/controlC0', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/controlC29', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  Date: Mon Nov  4 12:31:48 2013
  HibernationDevice: RESUME=UUID=1fbfa69c-fb52-4aee-ad35-9c523aa14974
  InstallationDate: Installed on 2009-12-21 (1414 days ago)
  InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release amd64 (20091027)
  MachineType: LENOVO 2436CTO
  MarkForUpload: True
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-32-generic root=/dev/mapper/ssd-root ro vga=792 splash nox2apic crashkernel=384M-2G:64M,2G-:128M quiet splash
  RelatedPackageVersions:
   linux-restricted-modules-3.8.0-32-generic N/A
   linux-backports-modules-3.8.0-32-generic  N/A
   linux-firmware                            1.116
  SourcePackage: linux
  UpgradeStatus: Upgraded to saucy on 2013-11-04 (0 days ago)
  dmi.bios.date: 08/12/2013
  dmi.bios.vendor: LENOVO
  dmi.bios.version: G5ET94WW (2.54 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 2436CTO
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Defined
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvrG5ET94WW(2.54):bd08/12/2013:svnLENOVO:pn2436CTO:pvrThinkPadW530:rvnLENOVO:rn2436CTO:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 2436CTO
  dmi.product.version: ThinkPad W530
  dmi.sys.vendor: LENOVO

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