RE: Gateway 200X (again) - No power button events

[Greg Sarjeant <greg-QNIYhHqVzB9kr2E5YSwMOQ@public.gmane.org>]

On Tue, 2004-01-20 at 18:27, Grover, Andrew wrote:
> That is correct. So, the code ignores a CM power button if a FF button
> is found. There is a bit in the FADT that declares if the power button
> is fixed or control-method.
> 
> PWR_BUTTON A zero indicates the power button is handled as a fixed
> feature programming model; a one indicates the power
> button is handled as a control method device. If the system
> does not have a power button, this value would be "1" and
> no sleep button device would be present.
> 
> (I think that "sleep" should be "power" but anyways...)
> 
> So the FF pwr button gets priority. You can comment out a few lines in
> scan.c acpi_bus_scan_fixed(), and it should not register the FF power
> button. That might be interesting to try.
> 
> Regards -- Andy

Aha! That did the trick.

I commented out these three lines:

	if (acpi_fadt.pwr_button == 0)
		result = acpi_bus_add(&device, acpi_root, 
			NULL, ACPI_BUS_TYPE_POWER_BUTTON);


And now dmesg reports:

ACPI: Processor [CPU0] (supports C1 C2 C3, 8 throttling states)
ACPI: Lid Switch [LID0]
ACPI: Sleep Button (CM) [SLPB]
ACPI: Power Button (CM) [PWRB]
ACPI: AC Adapter [ADP1] (on-line)
ACPI: Battery Slot [BAT1] (battery present)
[ACPI Debug] String: Not Support
ACPI: Thermal Zone [THRM] (50 C)
ACPI: Fan [FAN0] (on)

So, it is picking up the Control Method Power Button, and I get events
from it now. Outstanding.

When I was googling around, I saw a lot of references to a patch for 2.4
that ignores Fixed Feature buttons when Control Method buttons are
found. For example:

http://www.funet.fi/pub/Linux/PEOPLE/Linus/v2.4/patch-html/patch-2.4.14/linux_drivers_acpi_ospm_button_bn_osl.c.html

Hm - now that I look at it again, the author name is familiar :)

Is this something that might find its way into the main kernel tree?
Should I submit a bug for this behavior?

Thanks for the suggestion!
Greg



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