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Date:	Fri, 18 Apr 2008 08:51:04 +0200
From:	Oliver Neukum <>
To:	Paulius Zaleckas <>
Subject: Re: [RFC] Patch to option HSO driver to the kernel

Am Donnerstag, 17. April 2008 23:47:27 schrieb Paulius Zaleckas:
> Oliver Neukum wrote:
> > can you test this one as well. The method used to determine whether
> > a device is asleep is racy. This introduces a private test.
> Stupid question :) How to test it? How can I force it to suspend?
> I have never used any suspend on my PC :)

This is runtime power management. It can save energy on any computer.
You compile your kernel with CONFIG_USB_SUSPEND and to see something
in syslog with CONFIG_USB_DEBUG.
Plug in the device, locate its sysfs directory, cd into it and do
echo "auto" >power/level

After a few seconds of idleness the device and the hub it's connected to
(if it's the only device at that hub) should suspend. You'll get a message
about it in the kernel log.

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