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

Alan Stern
2012-05-11T14:08:33Z

On Thu, 10 May 2012, Sarah Sharp wrote:

> Also, setting the port power off via ACPI may not actually cut power,
> because port power might be ganged. Once we signal via ACPI that all
> the ports that are ganged together can be powered off, they will. So
> there's no guarantees that you can power off the buggy modem unless you
> power off the other ganged ports as well.

That reminds me... I think this should not be so closely linked with
ACPI. There's a perfectly good USB Clear-Feature request for turning
off port power; that's what we should use. If hooks are required for
interfacing with platform-specific code (such as ACPI), they can be
added at the appropriate places.

Alan Stern

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