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What:           /sys/bus/usb/devices/.../power/autosuspend
Date:           March 2007
KernelVersion:  2.6.21
Contact:        Alan Stern <stern@rowland.harvard.edu>
Description:
                Each USB device directory will contain a file named
                power/autosuspend.  This file holds the time (in seconds)
                the device must be idle before it will be autosuspended.
                0 means the device will be autosuspended as soon as
                possible.  Negative values will prevent the device from
                being autosuspended at all, and writing a negative value
                will resume the device if it is already suspended.

                The autosuspend delay for newly-created devices is set to
                the value of the usbcore.autosuspend module parameter.

What:           /sys/bus/usb/devices/.../power/level
Date:           March 2007
KernelVersion:  2.6.21
Contact:        Alan Stern <stern@rowland.harvard.edu>
Description:
                Each USB device directory will contain a file named
                power/level.  This file holds a power-level setting for
                the device, one of "on", "auto", or "suspend".

                "on" means that the device is not allowed to autosuspend,
                although normal suspends for system sleep will still
                be honored.  "auto" means the device will autosuspend
                and autoresume in the usual manner, according to the
                capabilities of its driver.  "suspend" means the device
                is forced into a suspended state and it will not autoresume
                in response to I/O requests.  However remote-wakeup requests
                from the device may still be enabled (the remote-wakeup
                setting is controlled separately by the power/wakeup
                attribute).

                During normal use, devices should be left in the "auto"
                level.  The other levels are meant for administrative uses.
                If you want to suspend a device immediately but leave it
                free to wake up in response to I/O requests, you should
                write "0" to power/autosuspend.

What:           /sys/bus/usb/devices/.../power/persist
Date:           May 2007
KernelVersion:  2.6.23
Contact:        Alan Stern <stern@rowland.harvard.edu>
Description:
                If CONFIG_USB_PERSIST is set, then each USB device directory
                will contain a file named power/persist.  The file holds a
                boolean value (0 or 1) indicating whether or not the
                "USB-Persist" facility is enabled for the device.  Since the
                facility is inherently dangerous, it is disabled by default
                for all devices except hubs.  For more information, see
                Documentation/usb/persist.txt.