From mboxrd@z Thu Jan 1 00:00:00 1970 From: Thomas Bettler Subject: module uhci-ucd and powermanagement Date: Fri, 10 Dec 2004 19:22:42 +0100 Message-ID: <200412101922.42208.bettlert@student.ethz.ch> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: Content-Disposition: inline Sender: linux-newbie-owner@vger.kernel.org List-Id: Content-Type: text/plain; charset="us-ascii" To: linux-newbie@vger.kernel.org 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 - To unsubscribe from this list: send the line "unsubscribe linux-newbie" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.linux-learn.org/faqs