Re: [linux-usb-devel] Fwd: USB suspending

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Am Freitag 05 Oktober 2007 schrieb Rafael J. Wysocki:
> Hi,
> 
> Below is a Lukas' question related to USB suspend that I'm not able to answer.
> 
> Please help!
> 
> Greetings,
> Rafael
> 
> 
> ----------  Forwarded Message  ----------
> 
> Subject: USB suspending
> Date: Friday, 5 October 2007 14:54
> From: Lukas Hejtmanek <xhejtman@xxxxxxxxxxx>
> To: "Rafael J. Wysocki" <rjw@xxxxxxx>
> 
> Hello,
> 
> I've noticed that while suspended in RAM USB ports are powered so any device
> connected to the port gets power. Can I turn off power of all USBs ports while
> suspending to RAM?

If you do that all devices on these ports will be disconnected.
If you still insist on doing so, it is done by a USB control request.
But power consumption on these ports is minimal for suspended devices,
so it is a bad idea.

	HTH
		Oliver
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