Comment 129 for bug 760131

I'm on a Lenovo X301. dmesg says this system does not support ASPM but battery life is still poor.

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-----Original Message-----
From: RussianNeuroMancer <email address hidden>
Sender: <email address hidden>
Date: Fri, 01 Jul 2011 02:33:56
To: <email address hidden>
Reply-To: Bug 760131 <email address hidden>
Subject: [Bug 760131] Re: Power consumption raised significantly in natty

http://lwn.net/Articles/449648/

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Title:
  Power consumption raised significantly in natty

Status in Release Notes for Ubuntu:
  Fix Released
Status in “linux” package in Ubuntu:
  Triaged
Status in “linux” source package in Natty:
  Incomplete
Status in “linux” source package in Oneiric:
  Triaged

Bug description:
  This is a regression moving from maverick->natty. With the same sort
  of light interactive usage, Battery life has gone from ~4 hours to
  2:45 or so.

  Running powertop shows the system in P-state "Turbo mode" 10-15% of
  the time. Typically this was almost zero in maverick, 98+% of the
  time maverick was in the lowest state.

  wakeups reported in the 5-600/s range where previously (from memory)
  it was 200 ish. i915 driver is high on the list. This is
  irrespective of whether running unity or classic desktop.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.04
  Package: linux-image-2.6.38-8-generic 2.6.38-8.42
  Regression: Yes
  Reproducible: Yes
  ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
  Uname: Linux 2.6.38-8-generic x86_64
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
  Architecture: amd64
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: Intel [HDA Intel], device 0: CONEXANT Analog [CONEXANT Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER PID ACCESS COMMAND
   /dev/snd/controlC0: james 2068 F.... pulseaudio
  CRDA: Error: [Errno 2] No such file or directory
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xf2620000 irq 47'
     Mixer name : 'Conexant CX20561 (Hermosa)'
     Components : 'HDA:14f15051,17aa20ff,00100000'
     Controls : 16
     Simple ctrls : 8
  Card29.Amixer.info:
   Card hw:29 'ThinkPadEC'/'ThinkPad Console Audio Control at EC reg 0x30, fw 7XHT24WW-1.06'
     Mixer name : 'ThinkPad EC 7XHT24WW-1.06'
     Components : ''
     Controls : 1
     Simple ctrls : 1
  Card29.Amixer.values:
   Simple mixer control 'Console',0
     Capabilities: pswitch pswitch-joined penum
     Playback channels: Mono
     Mono: Playback [on]
  Date: Wed Apr 13 15:03:35 2011
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=bb479652-f524-4abe-b1b0-27646d6deebc
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release Candidate amd64 (20100928)
  MachineType: LENOVO 7465CTO
  ProcEnviron:
   LANGUAGE=en_US:en_GB:en
   PATH=(custom, user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-8-generic root=UUID=266abe9a-19c2-4cc3-9ef7-238b729b6044 ro quiet splash libata.force=noncq vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-2.6.38-8-generic N/A
   linux-backports-modules-2.6.38-8-generic N/A
   linux-firmware 1.50
  RfKill:
   0: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no
  SourcePackage: linux
  UpgradeStatus: Upgraded to natty on 2011-04-06 (7 days ago)
  dmi.bios.date: 11/10/2009
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 6DET61WW (3.11 )
  dmi.board.name: 7465CTO
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvr6DET61WW(3.11):bd11/10/2009:svnLENOVO:pn7465CTO:pvrThinkPadX200s:rvnLENOVO:rn7465CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 7465CTO
  dmi.product.version: ThinkPad X200s
  dmi.sys.vendor: LENOVO

  === Release Notes ===

  Due to a regression inherited from the upstream linux kernel, Natty 11.04 can exhibit a 10-30% increase in power consumption. This is a known issue which is actively being investigated. A SRU will be released onced a viable solution is found. For more information, please see
  http://www.phoronix.com/scan.php?page=article&item=linux_mobile_uffda&num=1

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