From mboxrd@z Thu Jan 1 00:00:00 1970 From: Johnathan Hicks Subject: Re: CX > 1 support for Athlon SMP systems Date: Tue, 23 Jul 2002 22:45:45 -0400 Sender: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Message-ID: <3D3E14D9.50009@folkwolf.net> References: <3D3B879A.5020401@folkwolf.net> <1027351350.3d3c23363ea3d@carlthompson.net> <3D3CBF78.4010007@folkwolf.net> <1027461971.3d3dd353462e8@carlthompson.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Return-path: Errors-To: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Help: List-Post: List-Subscribe: , List-Unsubscribe: , List-Archive: To: acpi-devel List-Id: linux-acpi@vger.kernel.org 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. > At any rate, since the power savings is comparable to ACPI and the > only reason I was using ACPI on these laptops was for the power > savings, I have switched to using lvcool + APM instead of ACPI. > Battery life seems about the same, and it eliminates the issues I was > having with ACPI (CPU usage reading battery status, dropped > characters, USB weirdness, undocumented inteface, etc). ACPI will likely be fixed eventually... ;-) > BTW, APM uses about 1/50th to 1/100th the processor time reading > battery status on my laptop compared to using ACPI. No joke. Yikes! That's no good, when under CPU load anyway... --John ------------------------------------------------------- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf