kernel-packages team mailing list archive

[Po-Hsu Lin <po-hsu.lin@xxxxxxxxxxxxx>]

Hello David,

I'm not sure to what extent this tweak will affect the battery life.

I tried to measure the power consumption today, with and without these two options individually.
But I can't tell the real difference between them, the reading will jump within a certain range.
Maybe the euipement we have here (IDRC CP-268) is not up for this job (it's being tested with adapter connected), or maybe I don't have enough knowledge for using it.

Test enviroment:
Laptop with battery removed, Wifi / Bluetooth turned off, backlight tuned down to the lowest level.
Power comsumption (total wattage) measured by IDRC CP-268, with laptop adapter connected to it.

Test result:
Wattage jumps aroung 11.31 ~ 11.38 in these three secnerios.

If there is any difference, it looks like it's less than 0.1 watt, but
again, I'm not very confident about this.

If you need a much more precise test report, I think I can imporve it by
choosing a SSD laptop, with all extra modules removed. And sample the
reading every 10 minute to get an average. (Or do you have any
recommended testing technique or software?)

Also, there is a simliar bug reported by QA before:
https://bugs.launchpad.net/somerville/+bug/1067672
>From here, maybe it indicates that the "options snd-hda-intel power_save_controller=N" could be an acceptable fix.

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https://bugs.launchpad.net/bugs/1383997

Title:
  [Dell Vostro 5470] No HDMI audio with 14.04

Status in HWE Next Project:
  Triaged
Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  CID: 201307-14037 Dell Vostro 5470

  There is no HDMI audio output option available when you connect the
  HDMI monitor (with speaker) to this system.

  Verified with cold plug, still no luck.

  However, HDMI audio could be detected with cold plug on 12.04.4 (3.11
  kernel) stock Ubuntu, tested with LiveUSB

  Alsa-info:
  http://www.alsa-project.org/db/?f=8e5ccdaae7aa4b3a05862385b902f824be65f0bd

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-37-generic 3.13.0-37.64
  ProcVersionSignature: Ubuntu 3.13.0-37.64-generic 3.13.11.7
  Uname: Linux 3.13.0-37-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  ubuntu     1589 F.... pulseaudio
   /dev/snd/controlC1:  ubuntu     1589 F.... pulseaudio
  CRDA:
   country TW:
   	(2402 - 2472 @ 40), (3, 27)
   	(5270 - 5330 @ 40), (3, 17), DFS
   	(5735 - 5815 @ 40), (3, 30)
  CurrentDesktop: Unity
  Date: Tue Oct 21 22:44:45 2014
  HibernationDevice: RESUME=UUID=420e55c0-b179-44d6-93d7-82393cdeec68
  InstallationDate: Installed on 2014-10-21 (0 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  MachineType: Dell Inc. Vostro 5470
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-37-generic.efi.signed root=UUID=a975e1af-1e52-4f17-8e69-190b4dc36b48 ro quiet splash
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-37-generic N/A
   linux-backports-modules-3.13.0-37-generic  N/A
   linux-firmware                             1.127.7
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/23/2013
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A01
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: White Tip Mountain
  dmi.board.vendor: Intel Corp.
  dmi.board.version: FAB3
  dmi.chassis.asset.tag: Asset Tag
  dmi.chassis.type: 9
  dmi.chassis.vendor: Intel Corporation
  dmi.chassis.version: 0.1
  dmi.modalias: dmi:bvnDellInc.:bvrA01:bd08/23/2013:svnDellInc.:pnVostro5470:pvr:rvnIntelCorp.:rnWhiteTipMountain:rvrFAB3:cvnIntelCorporation:ct9:cvr0.1:
  dmi.product.name: Vostro 5470
  dmi.sys.vendor: Dell Inc.

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