Re: [RFC PATCH] usb/acpi: Add support usb port power off mechanism for device fixed on the motherboard

Greg KH
2012-05-16T14:40:02Z

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?

greg k-h