On Thu, 2 Aug 2018, Muni Sekhar wrote:
> [ Please keep me in CC as I'm not subscribed to the list]
>
>
> Hello All,
>
>
> I’ve an Ubuntu 16.04 LTS PC with 4.4.0-124-generic kernel version.
>
> I want to test the dynamic suspend for the below mentioned connected
> USB device.
>
> Bus 003 Device 028: ID 0cf3:e300 Atheros Communications, Inc.
>
>
> First I’d like to know the required configuration(kernel built) of the
> kernel for supporting the dynamic suspend for USB.
>
> My kernel had been built with the below mentioned configuration:
> CONFIG_SUSPEND=y
> CONFIG_HIBERNATION=y
> CONFIG_PM=y
>
> Any other kernel configuration required for supporting the dynamic suspend?
No.
> How can I suspend a particular USB device?
You have to do something like:
echo auto >/sys/bus/usb/devices/.../power/control
where the "..." is filled in with the appropriate name for the
particular device. There are some programs, like powertop, which will
do this for you automatically.
> How do I verify whether the device went to suspended mode or
> not(without connecting the USB analyzer)?
cat /sys/bus/usb/devices/.../power/runtime_status
will tell you whether or not the device is currently suspended.
Alan Stern
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