linux-kernel - Re: [PATCH 2/4] toshiba_acpi: Support alternate hotkey interfaces

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Message-ID: <20111219182428.GC2737@thinkpad-t410>
Date:	Mon, 19 Dec 2011 12:24:28 -0600
From:	Seth Forshee <seth.forshee@...onical.com>
To:	Thomas Renninger <trenn@...e.de>
Cc:	Azael Avalos <coproscefalo@...il.com>,
	Matthew Garrett <mjg@...hat.com>, Len Brown <lenb@...nel.org>,
	platform-driver-x86@...r.kernel.org, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] toshiba_acpi: Support alternate hotkey interfaces

On Sun, Dec 18, 2011 at 03:01:35PM +0100, Thomas Renninger wrote:
> > In the DSDTs I've inspected there is an EC query method that looks like
> > it handles events for the hotkeys, but I've never been able to find
> > anything that will cause the GPE to trigger when the hotkeys are
> > pressed.
> Be careful, those EC event notifications do not show up in:
> /sys/firmware/acpi/interrupts/gpe*
> If no acpi irqs are happening (you said you've tried already):
> watch -n1 "cat /proc/interrupts |grep acpi"
> filtering the key events sounds appropriate.
> I see you dig quite a bit already:

I just went back and tried this specifically again to verify my memory
is correct. Without toshiba_acpi loaded, I see nothing. With it loaded
(with this patch series applied, which turns out to be important) I do
see the interrupt count increase. Further investigation leads me to
conclude that this activity appears to be associated with execution of
the INFO method -- reading and writing a variable in the EC address
space.

Seth
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