linux-kernel - Re: BUG: Fn keys not working on EliteBook 8460p after fabf85e3ca15d5b94058f391dac8df870cdd427a

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Date:	Thu, 18 Apr 2013 09:55:09 -0400
From:	Kyle Evans <kvans32@...il.com>
To:	Matthew Garrett <matthew.garrett@...ula.com>
CC:	Pali Rohár <pali.rohar@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"platform-driver-x86@...r.kernel.org" 
	<platform-driver-x86@...r.kernel.org>
Subject: Re: BUG: Fn keys not working on EliteBook 8460p after fabf85e3ca15d5b94058f391dac8df870cdd427a


On 04/17/2013 01:59 PM, Matthew Garrett wrote:
> On Wed, 2013-04-17 at 11:37 -0400, Kyle Evans wrote:
>> On 04/16/2013 12:26 PM, Matthew Garrett wrote:
>>> Can you try this patch?
>>>
>> No dice. I have a dmi check patch that I will send in a day or two if
>> you don't find what you are looking for.
> DMI's almost certainly the wrong solution. According to your DSDT, EC
> register 0xe6 is called SFHK. That's written to by the SSHK method,
> which in turn is executed by SHKS which should be called by the
> hp_wmi_query call added there. Any chance you can try to figure out why
> that's not happening?
>

I am not fully understanding how the bios query ID gets translated into 
the method. As far as I can tell this happens under HWMC. But, if I 
trace through that, 0x8(write) and 0x9(read) do not exist. However, 
0x9(read) does have a method that works when I query it, GHKS. I do not 
find the method for 0x8(write).

0x9(write), or SHKS, is essentially ec_write(SFHK,Arg0). Arg0 turns out 
to be whatever data is sent in the 0x9 buffer.
                                 ...
                                 CreateDWordField (Arg1, 0x10, DDWD)

                                 If (LEqual (CMDT, 0x09))
                                 {
                                     Store (SHKS (DDWD), Local2)
                                 ...

I tried writing 0x60, and I tried writing 0x0e just to see if it if a 
subset of that register is needed to enable the keys and it seems I need 
the full 0x6e. I only find two places in the DSDT with that value, both 
in the WQAE buffer and I can't see how that is used.
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