Re: Cannot shutdown power use from built in webcam in thinkpad T530 questions]

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Am 22.09.2013 22:36, schrieb Marc MERLIN:
> On Sun, Sep 22, 2013 at 04:32:08PM -0400, Alan Stern wrote:
>>> I'm somehow thinking there is a driver or hardware problem when the device
>>> does get stuck in a mode where it won't sleep properly again until the next
>>> reboot (just unloading/loading the driver does not fix this).
>>
>> That's quite possible.  But if it is a driver problem, wouldn't 
>> unloading and reloading the driver fix it?
>  
> You'd think that but it hasn't so far with this one device.
> 
>>>> You might get more information from a kernel with CONFIG_USB_DEBUG 
>>>> enabled.  Especially if you add
>>>>
>>>> #define VERBOSE_DEBUG
>>>>
>>>> to drivers/usb/core/driver.c before the first #include line.
>>>
>>> Do you think thaty would help debug the problem above, or not really? I'm
>>
>> There's no way to know in advance.
>>
>>> starting to think that the USB layer is not at fault, although I could be
>>> wrong I suppose.
>>
>> You asked for advice on things to try, and I suggested something.  
>> That's the best I can do.
> 
> Understood, just making sure this was still potentially useful considering
> what I found out since my last message.

Which version of powertop are you actually using? None of current
versions would show you Watt usage for devices.
you can use "watch grep . *" instead and check fallowing fields:
runtime_suspended_time - suspend time. If it is growing device is suspended
runtime_active_kids - if not zero, some program use it
control - if "on" then autosuspend is disabled.

-- 
Regards,
Oleksij
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