From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jiang Liu Subject: Re: Subject: [v3.19 Regression] x86, irq, acpi: Get rid of special handling of GSI for ACPI SCI Date: Wed, 15 Jul 2015 11:17:32 +0800 Message-ID: <55A5D0CC.6020100@linux.intel.com> References: <55A4132B.4030801@canonical.com> <55A47716.9070605@linux.intel.com> <55A54540.9050300@canonical.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <55A54540.9050300@canonical.com> Sender: linux-kernel-owner@vger.kernel.org To: Joseph Salisbury Cc: konrad.wilk@oracle.com, tony.luck@intel.com, joro@8bytes.org, Greg KH , Benjamin Herrenschmidt , "Rafael J. Wysocki" , Bjorn Helgaas , rdunlap@infradead.org, Yinghai Lu , bp@alien8.de, len.brown@intel.com, pavel@ucw.cz, Thomas Gleixner , LKML , mingo@redhat.com, hpa@zytor.com, x86@kernel.org, linux-pm@vger.kernel.org List-Id: linux-pm@vger.kernel.org On 2015/7/15 1:22, Joseph Salisbury wrote: > On 07/13/2015 10:42 PM, Jiang Liu wrote: >> On 2015/7/14 3:36, Joseph Salisbury wrote: >>> Hello Jiang, >>> >>> A kernel bug report was opened against Ubuntu [0]. It was found that >>> reverting the following commit resolves this bug: >>> >>> commit cd68f6bd53cf89d1d5ed889b8af65e9c3574a079 >>> Author: Jiang Liu >>> Date: Mon Oct 27 16:11:52 2014 +0800 >>> >>> x86, irq, acpi: Get rid of special handling of GSI for ACPI SCI >>> >>> The regression was introduced as of v3.19-rc1. >>> >>> I was hoping to get your feedback, since you are the patch author. Do >>> you think gathering any additional data will help diagnose this issue, >>> or would it be best to submit a revert request? >> Hi Joseph, >> Sorry for the trouble. It would be great if we could get >> more information about the bug, such as bug report info, dmesg and >> acpidump from the reporting system. >> Thanks! >> Gerry > Comments 3 and 4 have the requested information in the bugzilla bug: > https://bugzilla.kernel.org/show_bug.cgi?id=101301 > > Thanks again for the help! Hi Joseph, According to my investigation, it's an ACPI BIOS issue instead of a kernel bug. But it's actually a regression. Now we enforce stricter check for ACPI SCI interrupt, which exposes an implementation flaw in the virtual BIOS. I have posted the analysis at https://bugzilla.kernel.org/show_bug.cgi?id=101301 But I have no account at launchpad, so could you please help to copy the message to launchpad? https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1440072 Thanks! Gerry