From mboxrd@z Thu Jan 1 00:00:00 1970 From: Gerfried Maier Subject: CPU - Power state (Cx) usage count not working Date: Mon, 23 Jan 2006 09:19:49 +0100 Message-ID: <43D491A5.6010000@sbox.tugraz.at> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: Received: from mailrelay.tu-graz.ac.at ([129.27.2.202]:58766 "EHLO mailrelay1.tu-graz.ac.at") by vger.kernel.org with ESMTP id S1751419AbWAWITw (ORCPT ); Mon, 23 Jan 2006 03:19:52 -0500 Received: from [129.27.123.23] (emapc23.tu-graz.ac.at [129.27.123.23]) by mailrelay1.tu-graz.ac.at (8.13.5/8.13.5) with ESMTP id k0N8JoTo024891 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Mon, 23 Jan 2006 09:19:50 +0100 (CET) Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: linux-acpi@vger.kernel.org Hi everybody! According to the ACPI4Linux doc cat /proc/acpi/processor/CPU0/power should look like active state: C2 default state: C1 bus master activity: 00004f00 states: C1: promotion[C2] demotion[--] latency[000] usage[00033670] *C2: promotion[C3] demotion[C1] latency[084] usage[00357060] C3: promotion[--] demotion[C2] latency[120] usage[00000000] Unfortunaltely on my system (P4m 1800Mhz; 2.4.31 or .32) the usage count shows always 00000000. Unloading several modules (eg usb-ohci) has no effect. IIrc the count and the statistics were working in earlier times (arond 2.4.25+) All of them vanilla with the preemptive patch from http://www.kernel.org/pub/linux/kernel/people/rml/preempt-kernel/v2.4/ Is there anything I can do to figure out more on the reason? Of course I would like to know whether this is only a symptom for a minor proble or wheher the whole power-state thing is not working, resulting in shorter battery life. Thanks for your help! G. Maier