On Wed, May 16, 2012 at 10:54:13PM +0800, Lan Tianyu wrote: > On 2012/5/16 22:39, Greg KH wrote: > >On Wed, May 16, 2012 at 10:36:02AM -0400, Alan Stern wrote: > >>On Wed, 16 May 2012, Lan Tianyu wrote: > >> > >>>Ok. Let me reconfirm the meaning of these opinions. > >>> > >>>"auto" > >>> if port without device, turn off power directly. > >>> if port with device, turn off power when the device is suspended. > >>> > >>>"on" the port's power must be on. > >>> > >>>"off" the port's power must be off. > >>> > >>>Right? > >>Maybe the "auto" setting should be renamed "active". Then "auto" can > >>be used for: > >> > >> If the port has a device, turn the power on. > >> If the port doesn't have a device, turn the power off. > >And plugging a new device into a port that was powered off is going to > >cause the power to come back on, right? > When the port was powered off, the connect-change event will not be > detected and > we don't know a device was plugged in. :( Then that doesn't seem like a very good thing to ever do, right? greg k-h -- 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
