linux-kernel - Re: GPE storm detected, disabling EC GPE

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Date:	Mon, 30 Jun 2008 21:59:50 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	"Justin Mattock" <justinmattock@...il.com>,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	Alexey Starikovskiy <alexey.y.starikovskiy@...el.com>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: GPE storm detected, disabling EC GPE

On Monday, 30 of June 2008, Andrew Morton wrote:
> On Thu, 5 Jun 2008 21:01:55 +0000
> "Justin Mattock" <justinmattock@...il.com> wrote:
> 
> > FWIW I noticed a post where the person had changed 5 to 20, and it
> > seemed to work for them;
> > So with that in mind I decide to give that a go, here is the location:
> > drivers/acpi/ec.c
> > @@ -527,47 +488,51 @@ static u32 acpi_ec_gpe_handler(void *data)
> >  {
> >         acpi_status status = AE_OK;
> >         struct acpi_ec *ec = data;
> >        u8 state = acpi_ec_read_status(ec);
> > 
> >         pr_debug(PREFIX "~~~> interrupt\n");
> >        atomic_inc(&ec->irq_count);
> > -       if (atomic_read(&ec->irq_count) > 5) {
> > +       if (atomic_read(&ec->irq_count) > 20) {
> >                pr_err(PREFIX "GPE storm detected, disabling EC GPE\n");
> >                ec_switch_to_poll_mode(ec);
> >                goto end;
> >        }
> > 
> > Now I don't know if this will work for other brands, but for
> > me(Macbook Pro ATI chipset) I have not received the
> > GPE storm detected, disabling EC GPE message, but it's only been an
> > hour, maybe after two or three this might appear.
> > Also is this good or bad to set 5 to 20 for the system?
> > regards;
> 
> We've had a few reports of this GPE-storm problem and I've rather lost
> track of what's happening.  Has anyone looked into it?

Yes, the problem is still being worked on, AFAICS.

> If not, do we have a bugzilla report where we can work on this?

There's a bugzilla entry at http://bugzilla.kernel.org/show_bug.cgi?id=10724 .

Thanks,
Rafael
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