Power usage 50% worse than 14.04 on MacBook Air 6,2

[Bostjan Skufca Jese]

Hi,

I do not know which package/condition to attribute this behaviour to, but MBA running Ubuntu 14.04 is using about 50% of power that needs to be delivered for 16.04. (minumum 10W power draw vs minimum ~5W draw).

Otherwise 16.04 works well.

Any clue how to tackle this?

Best,
b.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-31-generic 4.4.0-31.50
ProcVersionSignature: Ubuntu 4.4.0-31.50-generic 4.4.13
Uname: Linux 4.4.0-31-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: bostjan 3629 F.... pulseaudio
 /dev/snd/controlC1: bostjan 3629 F.... pulseaudio
Date: Fri Aug 5 02:29:33 2016
EcryptfsInUse: Yes
HibernationDevice: RESUME=UUID=a1169bd1-3502-4168-a9f9-639255a224c0
InstallationDate: Installed on 2016-08-04 (0 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
MachineType: Apple Inc. MacBookAir6,2
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-31-generic.efi.signed root=/dev/mapper/as--u--vg-root ro quiet splash vt.handoff=7
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-4.4.0-31-generic N/A
 linux-backports-modules-4.4.0-31-generic N/A
 linux-firmware 1.157.2
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 02/07/2014
dmi.bios.vendor: Apple Inc.
dmi.bios.version: MBA61.88Z.0099.B09.1402071141
dmi.board.asset.tag: Base Board Asset Tag#
dmi.board.name: Mac-7DF21CB3ED6977E5
dmi.board.vendor: Apple Inc.
dmi.board.version: MacBookAir6,2
dmi.chassis.type: 10
dmi.chassis.vendor: Apple Inc.
dmi.chassis.version: Mac-7DF21CB3ED6977E5
dmi.modalias: dmi:bvnAppleInc.:bvrMBA61.88Z.0099.B09.1402071141:bd02/07/2014:svnAppleInc.:pnMacBookAir6,2:pvr1.0:rvnAppleInc.:rnMac-7DF21CB3ED6977E5:rvrMacBookAir6,2:cvnAppleInc.:ct10:cvrMac-7DF21CB3ED6977E5:
dmi.product.name: MacBookAir6,2
dmi.product.version: 1.0
dmi.sys.vendor: Apple Inc.

[Brad Figg (brad-figg)]

This change was made by a bot.

[Joseph Salisbury (jsalisbury)]

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.7 kernel[0].

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.7

[Launchpad Janitor (janitor)]

[Expired for linux (Ubuntu) because there has been no activity for 60 days.]

[Bostjan Skufca Jese (bostjanskufcajese)]

Hi Joseph,

Sorry for the late response, I did not receive the notification for some reason.

I did test at the time, with all latest 4.5.x, 4.6.x and 4.7.x kernels, no change.

It would make sense to test with 4.8, or even better, wait for 4.9 and test it with that?

[penalvch (penalvch)]

bostjan, to keep this relevant to upstream, one would want check for, and test the latest mainline kernel (now 4.9-rc3) as it is released.

Could you please advise?

[Bostjan Skufca Jese (bostjanskufcajese)]

Thank you for response, will do it tonight and update bug with results.

On 2 November 2016 at 14:13, Christopher M. Penalver <
<email address hidden>> wrote:

> bostjan, to keep this relevant to upstream, one would want check for,
> and test the latest mainline kernel (now 4.9-rc3) as it is released.
>
> Could you please advise?
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1610028
>
> Title:
> Power usage 50% worse than 14.04 on MacBook Air 6,2
>
> Status in linux package in Ubuntu:
> Incomplete
>
> Bug description:
> Hi,
>
> I do not know which package/condition to attribute this behaviour to,
> but MBA running Ubuntu 14.04 is using about 50% of power that needs to
> be delivered for 16.04. (minumum 10W power draw vs minimum ~5W draw).
>
> Otherwise 16.04 works well.
>
> Any clue how to tackle this?
>
>
> Best,
> b.
>
> ProblemType: Bug
> DistroRelease: Ubuntu 16.04
> Package: linux-image-4.4.0-31-generic 4.4.0-31.50
> ProcVersionSignature: Ubuntu 4.4.0-31.50-generic 4.4.13
> Uname: Linux 4.4.0-31-generic x86_64
> NonfreeKernelModules: wl
> ApportVersion: 2.20.1-0ubuntu2.1
> Architecture: amd64
> AudioDevicesInUse:
> USER PID ACCESS COMMAND
> /dev/snd/controlC0: bostjan 3629 F.... pulseaudio
> /dev/snd/controlC1: bostjan 3629 F.... pulseaudio
> Date: Fri Aug 5 02:29:33 2016
> EcryptfsInUse: Yes
> HibernationDevice: RESUME=UUID=a1169bd1-3502-4168-a9f9-639255a224c0
> InstallationDate: Installed on 2016-08-04 (0 days ago)
> InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64
> (20160420.1)
> MachineType: Apple Inc. MacBookAir6,2
> ProcFB: 0 inteldrmfb
> ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-31-generic.efi.signed
> root=/dev/mapper/as--u--vg-root ro quiet splash vt.handoff=7
> 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-4.4.0-31-generic N/A
> linux-backports-modules-4.4.0-31-generic N/A
> linux-firmware 1.157.2
> SourcePackage: linux
> UpgradeStatus: No upgrade log present (probably fresh install)
> dmi.bios.date: 02/07/2014
> dmi.bios.vendor: Apple Inc.
> dmi.bios.version: MBA61.88Z.0099.B09.1402071141
> dmi.board.asset.tag: Base Board Asset Tag#
> dmi.board.name: Mac-7DF21CB3ED6977E5
> dmi.board.vendor: Apple Inc.
> dmi.board.version: MacBookAir6,2
> dmi.chassis.type: 10
> dmi.chassis.vendor: Apple Inc.
> dmi.chassis.version: Mac-7DF21CB3ED6977E5
> dmi.modalias: dmi:bvnAppleInc.:bvrMBA61.88Z.0099.B09.1402071141:bd02/07/
> 2014:svnAppleInc.:pnMacBookAir6,2:pvr1.0:rvnAppleInc.:rnMac-
> 7DF21CB3ED6977E5:rvrMacBookAir6,2:cvnAppleInc.:
> ct10:cvrMac-7DF21CB3ED6977E5:
> dmi.product.name: MacBookAir6,2
> dmi.product.version: 1.0
> dmi.sys.vendor: Apple Inc.
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/
> 1610028/+subscriptions
>

[Bostjan Skufca Jese (bostjanskufcajese)]

I tested with this kernel:
linux-image-4.9.0-040900rc4-generic_4.9.0-040900rc4.201611052031_amd64.deb

No change.

[penalvch (penalvch)]

bostjan, to clarify, would any of the tips noted in https://help.ubuntu.com/community/PowerManagement/ReducedPower provide a WORKAROUND?

[Launchpad Janitor (janitor)]

[Expired for linux (Ubuntu) because there has been no activity for 60 days.]