From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751766AbWGZTZS (ORCPT ); Wed, 26 Jul 2006 15:25:18 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751767AbWGZTZS (ORCPT ); Wed, 26 Jul 2006 15:25:18 -0400 Received: from smtp-103-wednesday.noc.nerim.net ([62.4.17.103]:274 "EHLO mallaury.nerim.net") by vger.kernel.org with ESMTP id S1751766AbWGZTZR (ORCPT ); Wed, 26 Jul 2006 15:25:17 -0400 Date: Wed, 26 Jul 2006 21:25:27 +0200 From: Jean Delvare To: Thomas Tuttle Cc: linux-kernel@vger.kernel.org Subject: Re: PCI bus is hidden behind transparent bridge Message-Id: <20060726212527.5c9f4253.khali@linux-fr.org> In-Reply-To: <20060725220832.GA8214@phoenix> References: <20060725215639.GB8113@phoenix> <20060725220832.GA8214@phoenix> X-Mailer: Sylpheed version 2.2.6 (GTK+ 2.6.10; i686-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hi Thomas, > Since I upgraded my kernel back around 2.6.16, I stopped seeing my SMBus > adapter on the PCI bus, and thus could not get readings from the LM90 > sensor chip on my laptop. After trying the pci=assign-busses parameter, > the error messages about transparent busses go away, but I still can't > access the SMBus controller (it uses the i2c-i801 module, in case that > helps). Caused by this change: http://www.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=ce007ea59729d627f62bb5fa8c1a81e25653a0ad Long story short, the quirk unhiding the Intel 82801 SMBus can cause major trouble on resume. Thus it was disabled when suspend support is included in the kernel. You have to disable ACPI sleep states if you want it back. -- Jean Delvare