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

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Message-Id: <20080630123454.7f48b7e0.akpm@linux-foundation.org>
Date:	Mon, 30 Jun 2008 12:34:54 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Justin Mattock" <justinmattock@...il.com>
Cc:	linux-kernel@...r.kernel.org, rjw@...k.pl,
	linux-acpi@...r.kernel.org,
	Alexey Starikovskiy <alexey.y.starikovskiy@...el.com>
Subject: Re: GPE storm detected, disabling EC GPE

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?

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

Thanks.
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