linux-kernel - Re: acpi-test tree on eeepc: EC error message on second resume

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Message-ID: <48F0DE8C.6040309@tuffmail.co.uk>
Date:	Sat, 11 Oct 2008 18:12:44 +0100
From:	Alan Jenkins <alan-jenkins@...fmail.co.uk>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
CC:	Alexey Starikovskiy <astarikovskiy@...e.de>,
	linux acpi <linux-acpi@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: acpi-test tree on eeepc: EC error message on second resume

Rafael J. Wysocki wrote:
> On Saturday, 11 of October 2008, Alan Jenkins wrote:
>   
>> I've just run an acpi-test kernel on my EeePC and noticed a new issue. 
>> It seems to be caused (or revealed) by the EC interrupt transaction patch.
>>
>> On the second suspend/resume cycle, I see a kernel error message.
>>
>> [   78.747707] ACPI: Waking up from system sleep state S3
>> [   79.330001] ACPI: EC: input buffer not empty, aborting transaction
>> [   79.423327] ACPI: EC: non-query interrupt received, switching to
>> interrupt mode
>>
>> I still don't see any issues in the code.  I'll try getting a DEBUG
>> trace to see the EC interrupts.  Any other suggestions?
>>     
>
> Not really, but is this reproducible?  I mean, does it happen always on the
> second resume and does it happen on every next resume after the first one?
>
> Thanks,
> Rafael
>   

Ah.  No, I spoke to soon.  It happened on the second resume the first
two times I tried it.  But this third time with DEBUG enabled, it
happened on the first suspend/resume.

And it doesn't happen on all subsequent resumes either.  I've had one
suspend/resume without the error, just after a suspend/resume with the
error.

So it's not deterministic, but it is easy to reproduce.

Alan
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