From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965000AbZLGW2D (ORCPT ); Mon, 7 Dec 2009 17:28:03 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S934639AbZLGW2B (ORCPT ); Mon, 7 Dec 2009 17:28:01 -0500 Received: from cpsmtpm-eml102.kpnxchange.com ([195.121.3.6]:59463 "EHLO CPSMTPM-EML102.kpnxchange.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934416AbZLGW2B (ORCPT ); Mon, 7 Dec 2009 17:28:01 -0500 Message-ID: <4B1D8176.9040209@gmail.com> Date: Mon, 07 Dec 2009 23:28:06 +0100 From: Gertjan van Wingerde User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.5) Gecko/20091205 Lightning/1.0pre Shredder/3.0 MIME-Version: 1.0 To: Ingo Molnar , Yinghai Lu CC: LKML , erbrochendes@gmx.de, divinespear@gmail.com, andjelo@gmx.net Subject: Rt2x00 problem traced back to x86 ACPI/PCI/e820 handling. Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-OriginalArrivalTime: 07 Dec 2009 22:28:06.0864 (UTC) FILETIME=[8C6E3500:01CA778C] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Ingo, Yinghai, For a while now we have seen reports of the rt2x00 driver not working correctly where bogus information was read from the EEPROM. This resulted in a non-functional driver. It has been established that the problem has introduced itself sometimes in the 2.6.31 development cycle. Lately the failures have been traced back to commit 5d423ccd7ba4285f1084e91b26805e1d0ae978ed of a patch created by Yinghai and committed Ingo. Reverting this patch seems to fix the problems with the rt2x00 driver. Also, it has been established that another work-around is to supply the pci=use_crs boot parameter. Do any of you have any idea as to what is going on here, and if this is something where the rt2x00 driver is at fault, or where the x86 ACPI/PCI/e820 code is buggy? So far I can establish that all the cases for which it is known what kind of HW it is that these are all MSI laptops. The related bug reports are: http://bugzilla.kernel.org/show_bug.cgi?id=14460 https://bugs.launchpad.net/ubuntu/+source/linux/+bug/404596 --- Gertjan.