Webcam uses excessive power even when idle
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Expired
|
Low
|
Unassigned |
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/
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-
ProcVersionSign
Uname: Linux 3.0.0-12-generic x86_64
NonfreeKernelMo
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/
/dev/snd/
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,
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,
Controls : 16
Simple ctrls : 4
Date: Thu Sep 29 10:54:23 2011
HibernationDevice: RESUME=
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=
RelatedPackageV
linux-
linux-
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-
dmi.product.name: HP EliteBook 8540w
dmi.sys.vendor: Hewlett-Packard
Changed in linux (Ubuntu): | |
status: | New → Confirmed |
Changed in linux (Ubuntu): | |
status: | Incomplete → Confirmed |
On second look it appears the udev rule did not put the issue down. I will do some additional testing but it appears that the device starts using excessive power again after a suspend/resume cycle. Resetting the power level to "auto" again turns it off.