Howdy,
I have a T530 with a built in webcam that uses the uvcvideo driver.
Kernel 3.10.6, but the problem has been there for many kernel versions.
>From time to time (not always) it shows up at the top of powertop with
an unexplained high power use while I'm not using the camera.
Powertop says autosuspend is active:
Note that tunables says:
Good Autosuspend for USB device Integrated Camera [Chicony Electronics Co., Ltd.]
Unloading uvcvideo makes no difference. However if I never load uvcvideo
and never use the camera after booting the laptop, then the device
doesn't use any power.
This is better than nothing, but not very desirable since I do use the
camera from time to google for video conferencing.
Here's the module info
gandalfthegreat:/sys/bus/usb/drivers/uvcvideo# l
total 0
drwxr-xr-x 2 root root 0 Sep 18 17:48 ./
drwxr-xr-x 12 root root 0 Sep 17 15:10 ../
lrwxrwxrwx 1 root root 0 Sep 18 21:30 3-1.6:1.0 -> ../../../../devices/pci0000:00/0000:00:1a.0/usb3/3-1/3-1.6/3-1.6:1.0/
lrwxrwxrwx 1 root root 0 Sep 18 21:30 3-1.6:1.1 -> ../../../../devices/pci0000:00/0000:00:1a.0/usb3/3-1/3-1.6/3-1.6:1.1/
--w------- 1 root root 4096 Sep 18 21:30 bind
lrwxrwxrwx 1 root root 0 Sep 18 21:30 module -> ../../../../module/uvcvideo/
-rw-r--r-- 1 root root 4096 Sep 18 21:30 new_id
-rw-r--r-- 1 root root 4096 Sep 18 21:30 remove_id
--w------- 1 root root 4096 Sep 18 17:48 uevent
--w------- 1 root root 4096 Sep 18 21:30 unbind
gandalfthegreat:/sys/bus/usb/devices/3-1.6/power# grep . *
active_duration:61227648
async:enabled
autosuspend:2
autosuspend_delay_ms:2000
connected_duration:66830880
control:auto
level:auto
persist:1
runtime_active_kids:0
runtime_active_time:18870052
runtime_enabled:enabled
runtime_status:active
runtime_suspended_time:5324088
runtime_usage:0
powertop 2.4 output:
---------------------------------------------------------------------
The battery reports a discharge rate of 18.4 W
The estimated remaining time is 4 hours, 18 minutes
Summary: 657.6 wakeups/second, 28.4 GPU ops/seconds, 0.0 VFS ops/sec and 9.3% CPU use
Power est. Usage Events/s Category Description
12.2 W 100.0% Device USB device: Integrated Camera (Chicony Electronics Co., Ltd.)
997 mW 60.0% Device Display backlight
76.1 mW 34.9 µs/s 34.8 Process [rcu_preempt]
23.1 mW 1.5 ms/s 16.5 Process xfce4-terminal -T window11 --role=window11
9.20 mW 59.0 ms/s 347.4 Process /usr/bin/enlightenment
---------------------------------------------------------------------
Now after I resumed from S3 sleep, this time I'm seeing
210 mW 100.0% Device USB device: Integrated Camera (Chicony Electronics Co., Ltd.)
While the 100% is bad, 210mW isn't as bad compared to 12W below (I'm sure it's not really 12W).
Any ideas?
Thanks,
Marc
--
"A mouse is a device used to point at the xterm you want to type in" - A.S.R.
Microsoft is to operating systems ....
.... what McDonalds is to gourmet cooking
Home page: http://marc.merlins.org/ | PGP 1024R/763BE901
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