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

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Date:	Wed, 11 Jun 2008 18:39:45 +0000
From:	"Justin Mattock" <justinmattock@...il.com>
To:	"Alexey Starikovskiy" <aystarik@...il.com>
Cc:	"Pavel Machek" <pavel@...e.cz>,
	"Alexey Starikovskiy" <astarikovskiy@...e.de>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	linux-acpi@...r.kernel.org
Subject: Re: ACPI: EC: GPE storm detected, disabling EC GPE

On Wed, Jun 11, 2008 at 10:29 AM, Alexey Starikovskiy
<aystarik@...il.com> wrote:
> Pavel Machek wrote:
>>
>> Hi!
>>
>> On Sat 2008-06-07 23:28:08, Alexey Starikovskiy wrote:
>>
>>>
>>> Justin Mattock wrote:
>>>
>>>>
>>>> On Sat, Jun 7, 2008 at 6:55 AM, Andrew Morton
>>
>>
>>>>
>>>> This issue just recently started, 2.6.25-rc9 and below don't give me
>>>> this message.
>>>>
>>>>
>>>
>>> Yes, the problem which we are fighting here is that almost all Acer
>>> notebooks come with
>>> broken EC. It sends interrupts not regarding the fact that we already
>>> ACKed it.
>>> It comes unnoticed on almost all machines (some notice laggy keyboard,
>>> because it's the same controller after all and it's busy with sending ACPI
>>> interrupts and then providing same status byte over and over), but on some
>>> machines keystrokes become missing, which is not tolerable (#9998).
>>>
>>
>> But the acer workaround breaks other machines, right?
>>
>>
>
> As I know, the first workaround broke your machine,
> may be you could check if it is broken now?
>>
>> So what about
>>
>> a) use dmi blacklist for acers?
>>
>>
>
> It is not only Acers. ASUS eeePC is known to be affected, some Apple
> notebook too.
>>
>> or
>>
>> b) if EC storm is detected print message telling 'please pass
>> ec_polled=true if you experience keyboard problems', but do nothing
>> else?
>>
>>
>
> There are no reports about broken machines for 2.6.26-rc5 beside #10724,
> which has same broken controller, sending same amount of stray interrupts.
> If there will be report from a good machine affected by this workaround then
> I will
> certainly go with b)
>
> Thanks,
> Alex.
>
>
>

FWIW: just to let you guys know over here with a Macbook Pro ATI
chipset, as a small test removing the battery
I did not receive this message after 5+ hours of uptime. Normally on a
good run with the battery attached I get around an hour or so before
this triggers.
regards;

-- 
Justin P. Mattock
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