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

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Date:	Sat, 11 Oct 2008 19:53:04 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Alan Jenkins <alan-jenkins@...fmail.co.uk>
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

On Saturday, 11 of October 2008, Alan Jenkins wrote:
> 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.

I can't reproduce this on any hardware available to me, so far.

Is this related to any other problem, like things not working etc.?

Rafael
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