Re: My Kernel bug is celebrating 2 years. Can you help me fix it?

[Peter Hurley <peter@hurleysoftware.com>]

[ +cc linux-acpi ]

On 03/07/2014 10:01 AM, Peter Senna Tschudin wrote:
> On Thu, Mar 6, 2014 at 8:08 PM, Peter Hurley <peter@hurleysoftware.com> wrote:
>> On 03/06/2014 01:27 PM, Bjorn Helgaas wrote:
>>>
>>> [+cc Stoney, Yinghai, Suresh, Joerg, Jiang, Pavel, Rafael, linux-pm]
>>>
>>> Let's add some folks who know about x2apic and VT-d.  It's hard for
>>> people to magically pick stuff out of the LKML firehose :)
>>>
>>> On Tue, Mar 4, 2014 at 2:26 PM, Peter Senna Tschudin
>>> <peter.senna@gmail.com> wrote:
>>>>
>>>> I have reported a bug more than two years ago and it is still
>>>> affecting me. The bug report gives some information:
>>>>
>>>> https://bugzilla.redhat.com/show_bug.cgi?id=787299
>>>>
>>>> I have tried basic debug instructions from:
>>>> https://www.kernel.org/doc/Documentation/power/basic-pm-debugging.txt
>>>>
>>>> And everything works as expected when:
>>>> # echo freeze > /sys/power/state
>>>> # echo disk > /sys/power/state
>>>>
>>>> I have asked for help for fixing it:
>>>> https://lkml.org/lkml/2013/11/1/186
>>>>
>>>> But I don't have a serial port. How can I debug this issue without a
>>>> "real" serial port? Or what else can I try? How can I explore the hint
>>>> about the problem only happening with VT-d enabled in BIOS? How can I
>>>> explore the hint about the problem not happening if the option
>>>> nox2apic is passed to the Kernel?
>>>>
>>>> Thank you,
>>>>
>>>> Peter
>>>>
>>>> P.S Yes, it works on Windows.
>>
>>
>> Windows 7 doesn't use x2apic mode.
>> Windows 8 does and this same problem happened with this model: see
>> http://forums.toshiba.com/t5/Windows-8-8-1/Resume-from-standby-issue-on-R830-PT321A-01K002/td-p/330110
> Thank you for the information. The model is similar to mine, probably
> the same motherboard. My tests were with Windows 7.

And more importantly, probably the same system firmware.


>> Seems like your model was recently added to Toshiba's Windows 8
>> compatibility list: http://support.toshiba-tie.co.jp/windows8/list_au.htm
>>
>> Check for a more recent BIOS update that may fix this problem.
> I do that weekly since February last year, and there are no updates
> available.  The bad news is that the model was discontinued, so it is
> possible that there will be no more BIOS updates. I'll write to
> Toshiba Europe GmbH asking for a fix, by my hopes in getting an answer
> are low.

Ok.

>>
>> Regards,
>> Peter Hurley
>>
>> PS - kernel bugs are better filed on the kernel bugzilla
>> https://bugzilla.kernel.org/
> Thank you!

I would file it under ACPI; perhaps a simple means of determining this
system firmware does not reliably support x2apic can be found (or perhaps not).

Please read REPORTING-BUGS; the latest is here
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/REPORTING-BUGS?id=refs/tags/v3.14-rc5

Good luck,
Peter Hurley