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[Launchpad Bug Tracker <862465@xxxxxxxxxxxxxxxxxx>]

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

** Changed in: linux (Ubuntu)
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/862465

Title:
  Webcam uses excessive power even when idle

Status in “linux” package in Ubuntu:
  Expired

Bug description:
  Machine is an HP Elitebook 8540w.  It is equipped with a Chicony
  webcam (USB ID 04f2:b15e).  Powertop reported that this device was
  using around 2W of power even when idle, despite the fact that
  /sys/bus/usb/devices/XXX/power/level was reporting "auto".  Explicitly
  setting the power/level to auto caused it to go into sleep mode, and
  powertop subsequently reported 0mW power consumption from the device.
  Likewise, explicitly adding a udev rule to set the power level to auto
  caused it to enter idle mode by default on bootup.

  After explicit setting of power level to auto camera still functions
  perfectly when needed and properly sleeps again after program exits.

  2W is a significant amount of power even for this hog of a machine
  (typically uses 26W).

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: linux-image-3.0.0-12-generic 3.0.0-12.19
  ProcVersionSignature: Ubuntu 3.0.0-12.19-generic 3.0.4
  Uname: Linux 3.0.0-12-generic x86_64
  NonfreeKernelModules: nvidia
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 1.23-0ubuntu2
  Architecture: amd64
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  jpeverill   2479 F.... pulseaudio
   /dev/snd/controlC0:  jpeverill   2479 F.... pulseaudio
  CRDA: Error: [Errno 2] No such file or directory
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xd7520000 irq 61'
     Mixer name	: 'IDT 92HD75B3X5'
     Components	: 'HDA:111d7603,103c1521,00100202 HDA:11c11040,103c3066,00100200'
     Controls      : 14
     Simple ctrls  : 9
  Card1.Amixer.info:
   Card hw:1 'NVidia'/'HDA NVidia at 0xd3000000 irq 17'
     Mixer name	: 'Nvidia GPU 0d HDMI/DP'
     Components	: 'HDA:10de000d,10de0101,00100100'
     Controls      : 16
     Simple ctrls  : 4
  Date: Thu Sep 29 10:54:23 2011
  HibernationDevice: RESUME=UUID=225ce4fd-7e06-4c7c-937f-821d810a7487
  MachineType: Hewlett-Packard HP EliteBook 8540w
  PccardctlIdent:
   Socket 0:
     product info: "RICOH", "Bay8Controller", "", ""
     manfid: 0x0000, 0x0000
     function: 254 (unknown)
  PccardctlStatus:
   Socket 0:
     3.3V 16-bit PC Card
     Subdevice 0 (function 0) bound to driver "pata_pcmcia"
  ProcEnviron:
   SHELL=/bin/bash
   PATH=(custom, user)
   LANG=en_US.UTF-8
   LANGUAGE=en_US:en
  ProcKernelCmdLine: root=UUID=4a4cfeb0-ad39-4293-bcaf-000d6538b550 ro quiet splash
  RelatedPackageVersions:
   linux-restricted-modules-3.0.0-12-generic N/A
   linux-backports-modules-3.0.0-12-generic  N/A
   linux-firmware                            1.60
  SourcePackage: linux
  StagingDrivers: mei
  UpgradeStatus: Upgraded to oneiric on 2011-09-24 (4 days ago)
  WpaSupplicantLog:
   
  dmi.bios.date: 03/09/2011
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: 68CVD Ver. F.0F
  dmi.board.name: 1521
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: KBC Version 32.33
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: dmi:bvnHewlett-Packard:bvr68CVDVer.F.0F:bd03/09/2011:svnHewlett-Packard:pnHPEliteBook8540w:pvr:rvnHewlett-Packard:rn1521:rvrKBCVersion32.33:cvnHewlett-Packard:ct10:cvr:
  dmi.product.name: HP EliteBook 8540w
  dmi.sys.vendor: Hewlett-Packard

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