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

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

[Bjorn Helgaas]

[+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.
>
> --
> Peter
> --
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Re: My Kernel bug is celebrating 2 years. Can you help me fix it?

[Peter Hurley]

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

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.

Regards,
Peter Hurley

PS - kernel bugs are better filed on the kernel bugzilla https://bugzilla.kernel.org/

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

[Peter Senna Tschudin]

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.

>
> 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.

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


-- 
Peter

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

[Peter Hurley]

[ +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