10.12.4 IntelBackLight.kext doesnt work anymore

[Ninjuan]

because brightness control works without a problem with the brighness DSDT fix and without any injector or anything, i just need to know how and where to set the PWMax values.

 

[Ninjuan]

got it working but still need to know how calculate pwmmax for 0x19120000. dont understand the tables in info.plist

 

[RehabMan]

ok found the config.dsl. However even after modification of LMAX to Sky 0x710 or "Ones" as well as selecting AppleBacklight - nothing changed.

when using the self patched AppleBacklightInjector.kext the screen brightness is stuck at a random value and cannot be changed anymore.

Read FAQ, "Problem Reporting"
https://www.tonymacx86.com/threads/faq-read-first-laptop-frequent-questions.164990/

Also, attach your AppleBacklightInjector.kext.

 

[RehabMan]

got it working but still need to know how calculate pwmmax for 0x19120000. dont understand the tables in info.plist

Note: Strange to use 0x19120000 for a laptop... (no LVDS connector, but maybe you're adding one with a patch?)

ig-platform-id data for 0x19120000:

00 00 12 19 00 00 00 00 FF 08 08 00 00 00 00 00 01 03 03 03 00 00 20 02 00 00 50 01 00 00 00 60
6C 05 00 00 6C 05 00 00 00 00 00 00 00 00 00 00
FF 00 00 00 01 00 00 00 20 00 00 00
01 05 09 00 00 04 00 00 87 01 00 00
02 04 0A 00 00 04 00 00 87 01 00 00
03 06 0A 00 00 04 00 00 87 01 00 00
0F 11 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 20 23 1B 00 00 00 00 00 70 24 1B 00 00 00 00 00 70 24 1B 00 00 00 00 00 01 00 00 00 08 00 00 00 01 00 00 00 00 00 00 00

You can see the PWMMax values on the second line. It is 0x056c.

 

[Ninjuan]

Read FAQ, "Problem Reporting"
https://www.tonymacx86.com/threads/faq-read-first-laptop-frequent-questions.164990/

Also, attach your AppleBacklightInjector.kext.

sorry i meant 191b not 1912. how did you get the platform data in the first place?

 

[RehabMan]

sorry i meant 191b not 1912. how did you get the platform data in the first place?

I open the kext binary in a hex editor then search for the platform data by searching for the ig-platform-id.
So for 0x191b0000, search for 00 00 1b 19.
You find this:

00 00 1B 19 00 00 00 00 FF 08 08 00 00 00 00 00 01 03 03 03 00 00 20 02 00 00 50 01 00 00 00 60 
6C 05 00 00 6C 05 00 00 00 00 00 00 00 00 00 00 
00 00 08 00 02 00 00 00 98 00 00 00 
01 05 09 00 00 04 00 00 87 01 00 00 
02 04 0A 00 00 04 00 00 87 01 00 00 
FF 00 00 00 01 00 00 00 20 00 00 00 
0F 11 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 20 23 1B 00 00 00 00 00 20 24 1B 00 00 00 00 00 70 24 1B 00 00 00 00 00 01 00 00 00 08 00 00 00 01 00 00 00 00 00 00 00

So, for 0x191b0000, the PWMMax is 0x56c.

 

[Ninjuan]

I open the kext binary in a hex editor then search for the platform data by searching for the ig-platform-id.
So for 0x191b0000, search for 00 00 1b 19.
You find this:

00 00 1B 19 00 00 00 00 FF 08 08 00 00 00 00 00 01 03 03 03 00 00 20 02 00 00 50 01 00 00 00 60
6C 05 00 00 6C 05 00 00 00 00 00 00 00 00 00 00
00 00 08 00 02 00 00 00 98 00 00 00
01 05 09 00 00 04 00 00 87 01 00 00
02 04 0A 00 00 04 00 00 87 01 00 00
FF 00 00 00 01 00 00 00 20 00 00 00
0F 11 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 20 23 1B 00 00 00 00 00 20 24 1B 00 00 00 00 00 70 24 1B 00 00 00 00 00 01 00 00 00 08 00 00 00 01 00 00 00 00 00 00 00

So, for 0x191b0000, the PWMMax is 0x56c.

i already thought of that, but which kext do you read? AppleBacklight.kext? I only found an entry in AppleIntelSKLGraphics, but this was different from what you posted. Additional question: from this, how do you get the corresponding ApplePanel entry for the correct AppleBacklightInjector?

 

[RehabMan]

i already thought of that, but which kext do you read?

That is from AppleIntelSKLGraphicsFramebuffer.

Additional question: from this, how do you get the corresponding ApplePanel entry for the correct AppleBacklightInjector?

The ApplePanel entry is determined from SMBIOS, PNLF._UID, and display-id (from EDID).

 

[Ninjuan]

That is from AppleIntelSKLGraphicsFramebuffer.



The ApplePanel entry is determined from SMBIOS, PNLF._UID, and display-id (from EDID).

is there a tutorial how to calculate it?

 

[RehabMan]

is there a tutorial how to calculate it?

The patch_backlight.sh script assumes _UID=10, and assumes a pattern of F<uid>T<display-id>, which corresponds to format "F%uT%04x".

If you look at the code in AppleBacklight (or even 'strings' output), you will see several other possibilities...

F%uP%04x
F%uT%04xM
F%uT%04xL
F%uT%04xD
F%uT%04xLD
F%uT%04xDL
F%uT%04x
F%uS%04x

I'm pretty sure I wrote about all this stuff in my guides/posts from years ago...