Am Mittwoch, 20. Juni 2012, 09:32:00 schrieb Viswanadha Palepu: > We have our company specific usb sensor device I see. You must make sure all interfaces of the device are idle. Then writing "auto" into the power/control file of the device should cause a suspend after 2 seconds of delay by default. If that doesn't happen and you have ruled out obvious causes you best compile a kernel with CONFIG_PM_DEBUG and CONFIG_USB_DEBUG. HTH Oliver -- 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