From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pavel Machek Subject: Re: acpi_idle: Very idle Core i7 machine never enters C3 Date: Mon, 1 Feb 2010 15:10:38 +0100 Message-ID: <20100201141038.GA1340@ucw.cz> References: <20100126084740.GA5265@jgarrett.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from atrey.karlin.mff.cuni.cz ([195.113.26.193]:35154 "EHLO atrey.karlin.mff.cuni.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752187Ab0BAOKr (ORCPT ); Mon, 1 Feb 2010 09:10:47 -0500 Content-Disposition: inline In-Reply-To: <20100126084740.GA5265@jgarrett.org> Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: Jeff Garrett Cc: linux-kernel@vger.kernel.org, Len Brown , linux-acpi@vger.kernel.org On Tue 2010-01-26 02:47:40, Jeff Garrett wrote: > Hi, > > I was trying to chase down a theory that my desktop machine (a core i7) > is running warm (the fan sounds like it's at full speed all the time, > and I think it's not always acted this way -- hence the theory). > > powertop is never showing it spending any time in C3... > > I compiled a kernel without USB/sound/radeon, and ran without X. I was > able to get the wakeups/sec down below 20, but no time is spent in C3. > This may be a complete red herring, but I added some printk logic to > acpi_idle_bm_check(), and it is getting called often, but bm_status is > always 1. [I infer from this that the idle logic is trying to go into > C3, but this check is stopping it... Unless I misread something.] > > Is this expected behavior or is this a legitimate problem? > > How might I investigate this further? DMA keeps system awake? Possibly USB? -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html