From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pavel Machek Subject: Re: C2, C3 and bus master activity Date: Thu, 21 Jul 2005 07:24:17 +0200 Message-ID: <20050721052417.GA7849@elf.ucw.cz> References: <200507192050.28343.pumpkin@gmx.de> <200507192118.37528.bob@diamond.demon.co.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <200507192118.37528.bob-l+PWtdWbHAsG2Il/BtU0GPXRex20P6io@public.gmane.org> 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: Bob Lees Cc: acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org, pumpkin-Mmb7MZpHnFY@public.gmane.org List-Id: linux-acpi@vger.kernel.org Hi! > In a word USB. I don't fully understand why, but if I disable USB then both > my laptops will go into C3 or C4, with USB enabled stays in C2. Misdesigned USB controllers do DMA all the time... I think it is uhci-specific problem. Pavel -- teflon -- maybe it is a trademark, but it should not be. ------------------------------------------------------- SF.Net email is sponsored by: Discover Easy Linux Migration Strategies from IBM. Find simple to follow Roadmaps, straightforward articles, informative Webcasts and more! Get everything you need to get up to speed, fast. http://ads.osdn.com/?ad_id=7477&alloc_id=16492&op=click