Alan, Oliver, On Sun, Apr 04, 2010 at 07:42:33PM +0200, Dominik Brodowski wrote: > Oliver, > > Unfortunately, autosuspend of btusb does not seem to work on my notebook > with 2.6.34-rc3: Debugging this a bit further (that's what long train rides are for): 1) btusb_open() gets called, which contains a pair of usb_autopm_get_interface(), usb_autopm_put_interface() calls. It sets needs_remote_wakeup = 1; in between there are two calls to usb_mark_last_busy(). 2) There follow a few usb_mark_last_busy() calls. 3) Then, btusb_close() gets called, which again contains a pair of usb_autopm_{get,put}_interface() calls. Once btusb_close() returns, atomic_read(&intf->dev.power.usage_count) returns 0. This means that after startup, this usage_count is 0. Nonetheless, btusb's suspend callback is never called, despite the following settings: # cat /sys/module/usbcore/parameters/autosuspend 2 # cat /sys/bus/usb/devices/7-1/power/level auto Best, Dominik -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html