linux-kernel - Re: [PATCH 27/30] ACPI: EC: Add a quirk for CLEVO M720T/M730T laptop

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Date:	Tue, 9 Oct 2012 14:22:06 +0800
From:	Feng Tang <feng.tang@...el.com>
To:	Jonathan Nieder <jrnieder@...il.com>
Cc:	Len Brown <lenb@...nel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Brown, Len" <len.brown@...el.com>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH 27/30] ACPI: EC: Add a quirk for CLEVO M720T/M730T
 laptop

Hi Jonathan,

On Tue, 9 Oct 2012 14:16:33 +0800
Jonathan Nieder <jrnieder@...il.com> wrote:

> Len Brown wrote:
> 
> > By enlarging the GPE storm threshold back to 20, that laptop's
> > EC works fine with interrupt mode instead of polling mode.
> 
> What would go wrong if the threshold were just increased to 20 on all
> models?

Then some other platform will stop to work.
	https://bugzilla.kernel.org/show_bug.cgi?id=11892 

The 26/30 and 27/30 patches are bound together to fix one bug. Some
quote from description from the 26th patch:

ACPI_EC_STORM_THRESHOLD was initially 20 when it's created, and
was changed to 8 in 2.6.28 commit 06cf7d3c7 "ACPI: EC: lower interrupt storm
threshold" to fix kernel bug 11892 by forcing the laptop in that bug to
work in polling mode.

Hope this answers your question.

Thanks,
Feng
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