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

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Date:	Sat, 7 Jun 2008 13:59:04 +0300
From:	Maxim Levitsky <maximlevitsky@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	"Justin Mattock" <justinmattock@...il.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	linux-acpi@...r.kernel.org,
	Alexey Starikovskiy <astarikovskiy@...e.de>
Subject: Re: ACPI: EC: GPE storm detected, disabling EC GPE

On Saturday, 7 June 2008 09:55:26 Andrew Morton wrote:
> On Sat, 7 Jun 2008 06:21:54 +0000 "Justin Mattock" <justinmattock@...il.com> wrote:
> 
> > Well; I was hoping it was going to be just an easy fix, but unfortunately
> > changing
> >  if (atomic_read(&ec->irq_count) > 5) {
> >  to
> > if (atomic_read(&ec->irq_count) > 20) {
> > does seem to make the message disappear, for a while, probably at
> > around three hours,(for me at least) then the message appeared again.
> > :-(
> > So leaving me back to the beginning of try to have a go at this.
> > regards;
> 
> I removed bugzilla from cc - that only works if there's [Bug 1234] in
> the Subject:.
> 
> I added linux-acpi to cc - this is an acpi problem.
> 
> What Justin is mysteriously referring to here is:
> 
> 
> : From: "Justin Mattock" <justinmattock@...il.com>
> : To: "Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
> : Cc: "Rafael J. Wysocki" <rjw@...k.pl>
> : Subject: GPE storm detected, disabling EC GPE
> : Date: 	Thu, 5 Jun 2008 21:01:55 +0000
> : Sender: linux-kernel-owner@...r.kernel.org
> : 
> : 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?
> 
> Could someone from acpi land please help here?
> 
> Justin, has this machine always had this problem or is it something
> which earlier kernels handled correctly?
> 
> Thanks.
> --
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> 

I have acer aspire 5720G which shows this message in latest -git
but doesn't show it in ubuntu 2.6.24 kernel.

I also noticed that in -git volume wheel behaves strangely, it sometimes increases volume
when I rotate it in direction of decrease, and vise versa.

Since the EC is in charge of volume wheel, it could be related.

Best regards,
	Maxim Levitsky
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