Re: Subject: [v3.19 Regression] x86, irq, acpi: Get rid of special handling of GSI for ACPI SCI

[Joseph Salisbury <joseph.salisbury@canonical.com>]

On 07/14/2015 11:17 PM, Jiang Liu wrote:
> 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 <jiang.liu@linux.intel.com>
>>>> 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
Thanks for the analysis and feedback, Gerry.  I'll update the launchpad
bug with your info.

Thanks,

Joe