From: Thomas Bettler <bettlert@student.ethz.ch>
To: linux-kernel@vger.kernel.org, linux-laptop@vger.kernel.org
Subject: module uhci-hcd and pm
Date: Fri, 10 Dec 2004 19:18:14 +0100 [thread overview]
Message-ID: <200412101918.24191.bettlert@student.ethz.ch> (raw)
In-Reply-To: <200412091447.11996.bettlert@student.ethz.ch>
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Hello you all
The uhci-hcd module causes the cpu to work at highest frequecy
(according to x86info -mhz). If I unload it, cpu frequency dropps from full
(1.8GHz) to ~2/3 (1.1GHz). In both cases top shows 97% or even 99% idle.
modprobing it again speeds the cpu up again.
So module uhci-hcd prehibits the cpu clock from saving power on notebooks. (At
least theese with P4-M cpus)
What code forces the cpu to run at high speed? Can I tweak the module to
permit slower cpu speed?
Thomas Bettler
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parent reply other threads:[~2004-12-10 18:18 UTC|newest]
Thread overview: expand[flat|nested] mbox.gz Atom feed
[parent not found: <200412091447.11996.bettlert@student.ethz.ch>]
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