Re: Brightness and "touchpad dis-/enable" keys not working for Fujitsu e7x6

[Jan-Marek Glogowski <glogow@fbihome.de>]

Am 23.06.2016 um 15:31 schrieb Michał Kępień:
>>> First I figured out (using a command almost identical to the one I
>>> suggested to you) which GPE is used for signalling brightness-related
>>> key presses on my Haswell machine.  This immediately led me to ACPI
>>> method _L11.  I selectively commented out ACPI code from this method,
>>> recompiling and overriding it using /sys/kernel/debug/acpi/custom_method
>>> after every change until I figured out exactly which method invocation
>>> causes the key events to be generated.  Once I knew that, I searched for
>>> a similar invocation in a Skylake DSDT dump.  This led me to ACPI method
>>> _L21, which is very similar to Haswell's _L11.
>>
>> Thanks for this info. I guess I can also debug the "disable touchpad"
>> button with this method.
> 
> If that button is supposed to be handled by ACPI, then yes, this should
> help.

I'm not sure if it's supposed to be handled by ACPI and not completely
in HW, like in the Haswell line, but I get Notify events for the fujitsu
driver.

>> I'm currently to recompiling my Ubuntu kernel, as it doesn't set
>> CONFIG_ACPI_CUSTOM_METHOD
> 
> Right, you are going to need that.
> 
>> Reading _L21, there are quite a few calls to Notify (\_SB.FEXT, 0x80),
>> which is exactly the notify function for the Fujitsu ACPI device.
>>
>> Actually there are a few more GPEs, which emit Notify (\_SB.FEXT, 0x80)
>> calls, which are caught by the fujitsu-notebook driver.
>>
>>>>> If it does, try overriding ACPI method _L21 [3] so that you can read
>>>>> the value of BSWF when the method is invoked.
>>
>> What's the easiest way to report the value to userspace? I don't think I
>> can add variables.
>>
>> My idea was to add a Notify (\_SB.FEXT, 0x80) into the BSWF branch, and
>> remove the Notify calls from all other branches.
>>
>> Probably even start by removing all Notify calls to be sure the function
>> actually is overwritten.
> 
> Just use the ACPI debug object.  Everything you need is in the
> documentation I have already referred you to (method-customizing.txt).

Ups. Sorry - too much parallel stuff going on today.
I'll really read the document and not just skim through it (which I did
after realizing my kernel misses the needed modules.

> I would simply use the original _L21 method with a "Store (BSWF, Debug)"
> line inserted just before the "If (BSWF)" conditional expression.

Yup.

Regards,

Jan-Marek