From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Yu, Luming" Subject: RE: Processor C states and USB problem Date: Mon, 12 Jan 2004 16:31:37 +0800 Sender: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Message-ID: <3ACA40606221794F80A5670F0AF15F8401720CB9@PDSMSX403.ccr.corp.intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Return-path: content-class: urn:content-classes:message Errors-To: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: Diego SANTA CRUZ , acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: linux-acpi@vger.kernel.org > I picked up this thread and I'm interested in knowing a bit more about > bus mastering and C3, as my laptop never goes into C3. I own a Dell > Inspiron 8500 (details at > http://ltswww.epfl.ch/~dsanta/resources/dell-i8500-linux). >=20 > This is what I get for the power states: > # cat /proc/acpi/processor/CPU0/power > active state: C2 > default state: C1 > bus master activity: ffffffff > states: > C1: promotion[C2] demotion[--]=20 > latency[000] usage[00039800] > *C2: promotion[C3] demotion[C1]=20 > latency[050] usage[00573330] > C3: promotion[--] demotion[C2]=20 > latency[050] usage[00000004] >=20 > I tried booting with init=3D/bin/sh and manually loading the processor > module, without any external hardware attached, so that no special > hardware is initialized, but still there is non-stopping bus mastering > activity. What could be causing it? Any ideas how could I find out? I just filed a tracker http://bugme.osdl.org/show_bug.cgi?id=3D1839. ------------------------------------------------------- This SF.net email is sponsored by: Perforce Software. Perforce is the Fast Software Configuration Management System offering advanced branching capabilities and atomic changes on 50+ platforms. Free Eval! http://www.perforce.com/perforce/loadprog.html