From mboxrd@z Thu Jan 1 00:00:00 1970 From: Carl Thompson Subject: Re: CX > 1 support for Athlon SMP systems Date: Wed, 24 Jul 2002 11:40:51 -0700 Sender: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Message-ID: <1027536051.3d3ef4b31fef6@carlthompson.net> References: <3D3B879A.5020401@folkwolf.net> <1027351350.3d3c23363ea3d@carlthompson.net> <3D3CBF78.4010007@folkwolf.net> <1027461971.3d3dd353462e8@carlthompson.net> <3D3E14D9.50009@folkwolf.net> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit Return-path: In-Reply-To: <3D3E14D9.50009-Pn2JTpibVOrk1uMJSBkQmQ@public.gmane.org> Errors-To: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Help: List-Post: List-Subscribe: , List-Unsubscribe: , List-Archive: To: Johnathan Hicks Cc: acpi-devel List-Id: linux-acpi@vger.kernel.org Quoting Johnathan Hicks : > Carl Thompson wrote: > > Wow. This actually seems to work on my Sony laptops. But I > > wonder if it is really puting the CPU in C2 because there is no > > additional power savings or temperature reduction than using ACPI. > > Is there any way to test if CPU is going in C2 state? > > I can't think of anything at the hardware level, but you do a printk > or something inside the while loop that contains the inb() in the > idle loop. What I mean is I know the loop is executing, but how do I know the processor is _really_ in C2? I was expecting a significant change in batterly life and CPU temp vs. the C1 state that ACPI put my CPU in. I haven't run definitive tests, but at best I'm only at most 15-20 minutes more battery life (if any at all). > ... > --John Carl Thompson ------------------------------------------------------- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf