Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751454AbdINAzX (ORCPT ); Wed, 13 Sep 2017 20:55:23 -0400 Received: from mail-io0-f180.google.com ([209.85.223.180]:44107 "EHLO mail-io0-f180.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751179AbdINAzW (ORCPT ); Wed, 13 Sep 2017 20:55:22 -0400 X-Google-Smtp-Source: AOwi7QAZbDyK1IWeMnX3VKYPghnel6EQnKBJYxspeGkCWkWzFuxGSxUqZernEjCA6x3g9AOk63XQXw== Subject: Re: Regression for Power PC in 4.14-rc0 - bisected to commit 31bfdb036f12 To: Andrew Donnellan , Benjamin Herrenschmidt , Paul Mackerras Cc: linuxppc-dev@lists.ozlabs.org, LKML References: <201709140009.v8E08n9S024108@mx0a-001b2d01.pphosted.com> <77fb14dd-26d5-a647-bed1-142d56d26374@au1.ibm.com> From: Larry Finger Message-ID: Date: Wed, 13 Sep 2017 19:55:20 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.3.0 MIME-Version: 1.0 In-Reply-To: <77fb14dd-26d5-a647-bed1-142d56d26374@au1.ibm.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 892 Lines: 21 On 09/13/2017 07:37 PM, Andrew Donnellan wrote: > On 14/09/17 10:07, Larry Finger wrote: >> When booting my PowerBook Aluminum G4, I get a pop-up screen that says "The >> system is running in low-graphics  mode. Your screen, graphics card, and input >> device settings could not be detected correctly. You will need to configure >> these yourself." This is a big-endian 74xx CPU. The lscpu command says it is a >> PowerBook5,6 model. >> >> This problem has been bisected to commit 31bfdb036f12 ("powerpc: Use >> instruction emulation infrastructure to handle alignment faults"). I am >> confident of the accuracy of the bisection. >> >> Attached is the configuration. > > Try with https://patchwork.ozlabs.org/patch/813153/ > > (A selftest for the instruction emulation will make its way upstream eventually...) That patch does fix my problem. Thanks for the quick response. Larry