On Sat, 22 Sep 2007, Hans de Goede wrote:
> >> Now call me naive, but I would expect a mass-storage devices with no
> >> partitions mounted to autosuspend when autosuspend is enabled for that device.
> >
> > Yes, that is naive. The driver has no way to tell whether or not any
> > partitions are mounted. Furthermore, you might very well want to
> > access the raw device without mounting any partitions (database
> > managers frequently do such things to reduce I/O overhead), in which
> > case you certainly would not the device to be autosuspended.
> >
>
> How does this relate to your "It works fine on my systems" remark, do I need to
> do anything other the unmounting the paritions to make the device eligible for
> autosuspend, like unbind the sd driver or even the usb-storage driver?
You shouldn't have to do anything. Mounted or unmounted, bound to sd
or not bound, it shouldn't matter. Provided the device isn't being
used, it ought to autosuspend.
I repeat: To find out what is really happening, you should use usbmon.
Alan Stern
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