From: Pavel Machek <pavel@ucw.cz>
To: David Brownell <david-b@pacbell.net>
Cc: linux-kernel@vger.kernel.org, linux-usb-devel@lists.sourceforge.net
Subject: Re: PATCH/RFC: driver model/pmcore wakeup hooks (0/4)
Date: Tue, 5 Oct 2004 21:32:39 +0200 [thread overview]
Message-ID: <20041005193238.GC4723@openzaurus.ucw.cz> (raw)
In-Reply-To: <200410041354.37932.david-b@pacbell.net>
Hi!
> One significant example involves USB mice. If they were to be
> suspended (usb_suspend_device) after a few seconds of inactivity,
> that change could often spread up the device tree and let the
> USB host controller stop DMA access. Some x86 CPUs could
> then enter C3 and save a couple Watts of battery power ... until
> the mouse moved, and woke that branch of the device tree
> for a while (until the mouse went idle again).
How fast is the wakeup? Will not that make mouse jump a bit? (Just curious...)
Pavel
--
64 bytes from 195.113.31.123: icmp_seq=28 ttl=51 time=448769.1 ms
next prev parent reply other threads:[~2004-10-05 19:54 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-10-04 20:54 PATCH/RFC: driver model/pmcore wakeup hooks (0/4) David Brownell
2004-10-05 19:32 ` Pavel Machek [this message]
2004-10-05 20:01 ` David Brownell
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