From mboxrd@z Thu Jan 1 00:00:00 1970 From: Nate Lawson Subject: Re: broken bm_sts on 82801CA? Date: Wed, 8 Oct 2003 09:55:35 -0700 (PDT) Sender: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Message-ID: <20031008095321.B10515@root.org> References: <20031006233406.N4792@root.org> <20031007085536.GB11391@poupinou.org> <20031007110948.V6708@root.org> <20031008123103.GG11391@poupinou.org> Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Return-path: In-Reply-To: <20031008123103.GG11391-kk6yZipjEM5g9hUCZPvPmw@public.gmane.org> Errors-To: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Help: List-Post: List-Subscribe: , List-Unsubscribe: , List-Archive: To: Ducrot Bruno Cc: acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: linux-acpi@vger.kernel.org On Wed, 8 Oct 2003, Ducrot Bruno wrote: > On Tue, Oct 07, 2003 at 11:10:37AM -0700, Nate Lawson wrote: > > On Tue, 7 Oct 2003, Ducrot Bruno wrote: > > > On Mon, Oct 06, 2003 at 11:38:07PM -0700, Nate Lawson wrote: > > > > My chipset claims to be: Intel 82801CA/CAM (ICH3) and it's on an IBM T23 > > > > thinkpad. While testing my Cx driver, I noticed that bm_sts is always > > > > set, even when I clear it by writing a 1 to the register. I _know_ the > > > > box is idle so I believe this bit to be broken. Can anyone confirm this? > > > > I noticed the errata probe for the PIIX4 but I don't think it covers my > > > > part. > > > > > > Have you any kind of usb bus support compiled in your kernel? > > > If yes, try without. > > > > Ah, I'll try that. I do have USB support compiled in. This is on > > FreeBSD, btw. > > That more an hardware design issue due to how hotplug work in usb busses > in general, and it may need to be workaround, so if anybody haven't yet worked on > C-states on FreeBSD.. Please note also that Linux do not workaround that > btw. I have implemented C-states in freebsd, that's how I ran into this problem. I'll be committing the code once it's cleaned up a little. Since Linux always demotes to "don't enter a Cx state" if bm_sts indicates activity, are you saying that if you have a USB bus configured in Linux, you don't even use C1 (HLT)? -Nate ------------------------------------------------------- This SF.net email is sponsored by: SF.net Giveback Program. SourceForge.net hosts over 70,000 Open Source Projects. See the people who have HELPED US provide better services: Click here: http://sourceforge.net/supporters.php