From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tony Lindgren Subject: C2/C3 don't do anything Date: Wed, 2 Feb 2005 19:46:40 -0800 Message-ID: <20050203034639.GA29164@atomide.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Sender: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Errors-To: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: linux-acpi@vger.kernel.org Hi all, I've been playing with Dynamic Tick, where the system timer is stopped for the idle ticks. This allows the system to stay in sleep mode inbetween the skipped ticks. [1] The most recent patch for dynamic-tick is [2] This works fine on ARM OMAP, but on my i386 boxes I've noticed that only hlt works, C2 and C3 just spin in a busy loop and consume more power than C1 with hlt! I've done an idle module few years ago that enables C2 for dual Athlon boxes [3], and that involved enabling it in the southbridge. I thought the current ACPI code enables this already? But it does not seem to be the case? Should we have some extra code to scan the southbridges, or what is the official way of handling that? It would be nice to get it enabled... At least my Crusoe based laptop with ALi 1533 chipset and Ali M7101 PMU does not get enabled. (Does anybody have docs to enable it on 1533/1535/7101???) Cheers, Tony [1] http://lkml.org/lkml/2005/1/27/270 [2] http://lkml.org/lkml/2005/1/27/270 [3] http://muru.com/linux/amd-smp-idle/ ------------------------------------------------------- This SF.Net email is sponsored by: IntelliVIEW -- Interactive Reporting Tool for open source databases. Create drag-&-drop reports. Save time by over 75%! Publish reports on the web. Export to DOC, XLS, RTF, etc. Download a FREE copy at http://www.intelliview.com/go/osdn_nl