[Guide] Patching DSDT/SSDT for LAPTOP backlight control

dronefriend said:

I'm running your VodooPS2Controller.kext.

The particular brightness keys did not generate PS2 codes in system.log. Some other FN keys did.

The keys generate ACPI events. I identified the keys as _Q1D (down) and _Q1C (up).

I tried

into method label _Q1D replace_content
begin
// Brightness Down\n
Notify(\_SB.PCI0.LPCB.PS2K, 0x0405)\n
end;
into method label _Q1C replace_content
begin
// Brightness Up\n
Notify(\_SB.PCI0.LPCB.PS2K, 0x0406)\n
end;

But MaciASL could not compile. I do not have this device in my DSDT _SB.PCI0.LPCB.PS2K. I have a _SB.PCI0.LPCB.PS2M only (mouse?).

Searching for "PS2K" in my dsdt.aml yields only 1 result. A value that says "1" , well deep under _SB.PCI0.LPCB.EC0.

What's my next step?

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RehabMan said:

- apply "Instrument EC Queries"

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agiorlando said:

Quick question, maybe you can answer. This is the part I'm having a problem with, it says "0 Changes" and does not allow me to Apply this patch. Everything up until this point has worked perfectly (no PS2 codes generated, using your kext). It appears my DSDT doesn't have the same _QXX labeling for keys, maybe? Any help appreciated, thanks! (original Clover F4 DSDT.dsl attached)

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RehabMan said:

No EC related code here. Either your laptop has no EC (rare), or the EC related code is in an SSDT.
Read post #1, "Problem Reporting".

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agiorlando said:

I checked all SSDT files as well, nothing. I did skip the SSDT X files. I'll do a more accurate problem report shortly.

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RehabMan said:

If you find no EmbeddedControl and no EC query methods (_Qxx), then it is likely your keys are handled via GPE methods. There is a patch to instrument those methods too (_Lxx).

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agiorlando said:

There were no EmbeddedControl or EC references. I applied the GPE patch (it allowed me to), but still nothing in the system log.

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agiorlando said:

Sorry, that was very outdated. I've updated my signature. I'm also on El Capitan, I should have just attempted Sierra but read there are unresolved issues.

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