From mboxrd@z Thu Jan 1 00:00:00 1970 From: "David W. Hankins" Subject: 8 cstates but only 4 to use? Date: Sat, 4 Mar 2006 05:54:23 +0000 Message-ID: <20060304055423.GC26099@isc.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 8BIT Return-path: Received: from farside.isc.org ([204.152.187.5]:46064 "EHLO farside.isc.org") by vger.kernel.org with ESMTP id S1750998AbWCDFyX convert rfc822-to-8bit (ORCPT ); Sat, 4 Mar 2006 00:54:23 -0500 Content-Disposition: inline Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: linux-acpi@vger.kernel.org I looked through the excellent Howto/FAQ provided by Glenn Ariel (thank you, sir), and he answered a lot of my questions, but was unable to find the answer to one remaining niggling curiosity. The 'power' procfile lists a max_cstate of C8, but only lists C1-C4 as usable states to enter...I notice it is also this way in the example file output provided in Mr. Ariel's howto, so this must not be uncommon or new. But, if 8 states are avaialble, why are only 4 in use? >>From a cursory investigation of the sources, it seems through #def's, this is a fixed upper limit. And I figure it can't be just that no one ever thought to #define 5-9, that would be silly. Thanks in advance, sorry if this is in a FAQ elsewhere, google is getting a lot of folks' dmesg output when I try to find answers along these lines. -- David W. Hankins "If you don't do it right the first time, Software Engineer you'll just have to do it again." Internet Systems Consortium, Inc. -- Jack T. Hankins