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.

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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