Yes, I noticed.

I compiled up a lucid kernel - 2.6.34,  runs fine on natty.  Strange
thing I see is that the ACPI reported power usage is the same on my
laptop, about 19 - 21 watts, yet I get 3.5 hours on that kernel
instead of the 2.1 hours on the natty kernel or the 2.6.39 source from
the linus tree.  I'm using the same nvidia blob on both.

If I switch to nouveau it increases the power usage noticeably, adds
about 4 watts in both cases while running gnome or unity and the xorg
edger's mesa and xorg binaries.

I don't understand how the ACPI power usage can be the same and still
have such a large variance for run time on the battery...



On 5/20/11, Miroslav <email address hidden> wrote:
> @nanog
>
> It seems to be not the cause...
>
> See:
> http://www.phoronix.com/scan.php?page=news_item&px=OTQ1Ng
>
> --
> You received this bug notification because you are a direct subscriber
> of the bug.
> https://bugs.launchpad.net/bugs/760131
>
> Title:
>   Power consumption raised significantly in natty
>
> Status in Release Notes for Ubuntu:
>   Fix Released
> Status in “linux” package in Ubuntu:
>   Confirmed
> Status in “linux” source package in Natty:
>   Confirmed
> Status in “linux” source package in Oneiric:
>   Confirmed
>
> 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
>
> To unsubscribe from this bug, go to:
> https://bugs.launchpad.net/ubuntu-release-notes/+bug/760131/+subscribe
>

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