From mboxrd@z Thu Jan 1 00:00:00 1970 From: Marco Calviani Subject: Re: Information regarding C3 cpu state and bus mastering activity Date: Tue, 13 Dec 2005 21:52:31 +0100 Message-ID: References: <439CC549.5060500@tzi.de> <439D726E.4020704@tzi.de> <200512130208.jBD280VU003725@mail.wrs.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Return-path: In-Reply-To: <200512130208.jBD280VU003725-2ArO/UEyFsZWk0Htik3J/w@public.gmane.org> 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 list, 2005/12/13, phutchis-CWA4WttNNZF54TAoqtyWWQ@public.gmane.org : > Might be OK, provided the USB host controller *can* be powered down > *and* we won't need to wake up due to someone touching the USB mouse > or keyboard :) Well, in my case the keyboard is not the problem since i'm running a laptop= .... Do you know how is possible to power down the usb controller? I was googling on this problem and i've found a page from Microsoft support center that describe the same problem (for W2K and ME) on that OS http://support.microsoft.com/default.aspx?scid=3DKB;EN-US;Q297045& They provide this "solution" (as i anticipated some mails ago): "To resolve this problem, increase the USB polling interval from one ms to five ms. Then, the processor can enter a C3 power-saving state during its inactivity and extend the battery life of the computer. To increase this polling interval, add a registry entry that is dependent upon the operating system" Any hint on how to implement this, and do you think that this can provide some help? Best regards, Marco Calviani ------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Do you grep through log files for problems? Stop! Download the new AJAX search engine that makes searching your log files as easy as surfing the web. DOWNLOAD SPLUNK! http://ads.osdn.com/?ad_id=7637&alloc_id=16865&op=click