Why does this USB device not autosuspend?

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                          Running powertop and tabbing over to "Device stats", I see 100% usage - which means no autosuspend - for "USB device: usb-device-8087-0a2a".

Googling this ID tells me it is a bluetooth device.  Or looking in sysfs.

    $ cd /sys/bus/usb/devices/1-1.3  # i don't know the logic to this
    $ cat idVendor
    8087
    $ cat idProduct 
    0a2a
    $ readlink driver */driver
    ../../../../../../bus/usb/drivers/usb
    ../../../../../../../bus/usb/drivers/btusb
    ../../../../../../../bus/usb/drivers/btusb

The driver supports autosuspend.  However the device that contains the btusb endpoints is considered used.

    $ cd power
    $ cat level
    auto
    $ cat autosuspend
    2
    $ cat runtime_active_kids 
    0
    $ cat runtime_usage
    1

This is despite me having no active bluetooth sockets

    $ netstat -a
    ...
    Active Bluetooth connections (servers and established)
    Proto  Destination       Source            State         PSM DCID   SCID      IMTU    OMTU Security
    Proto  Destination       Source            State     Channel

                        

Asked by sourcejedi (53232 rep)

Jan 4, 2017, 06:36 PM
Last activity: Jan 5, 2017, 03:37 PM

Why does this USB device not autosuspend?

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