[Solved] Dell Inspiron 3558: Brightness keys not working

[oldman20]

Hello, I've been researching for days about Fn+F11 and Fn+F12 to control screen brightness on Monterey. I tried all my best followed these topics:

But can't enable brightness hotkey, current here are all hotkey work native:

• Fn+Esc (Enable/ Disable Fn key) with On Screen Display OSD
• Fn+F1, F2, F3 for System Volume level with OSD
• Fn+F4, F5, F6 for Media control without OSD
• Fn+PrintScr for disconnect wifi (has no OSD)

Firstly follow The Dortania Guide Brightness key work with Fn+S, B. But after tried fix it, it gone too.

 I tried BrightnessKey.Kext too but still nothing. Here my EFI, DSDT just removed errors, OSCheckFix, kind of keyboard and trackpad with 

dmesg | grep -i input

 in Linux and IOReg file with IORegistryExplorer.app v2.1, Could you give some directions on how to solve this, please?

Many thank!

 

EFI OC 0.8.3

HackBook Pro.ioregFetching info...

DSDT.dsl.error.removed.fixOSCheck.zipFetching info...

dmesg_grep_input.rtf.zipFetching info...

[oldman20]

Current i also enable DellSMBIOSPatch and reset nvram twice but still not work

[Lorys89]

add ssdt xosi, add rename osid to xsid and rename _osi to xosi, add kext https://github.com/acidanthera/BrightnessKeys

use ssdt pnlf without rename gfx0 to igpu, use ssdt ec, plug. not use dsdt.

and you have i2c trakpad, i2c1 - tpd1 

add kext i2c and i2c hid 

put in this order :

 

add bootarg -wegnoegpu if you have dgpu

[oldman20]

Thanks, it is working now!

 

Sorry because my mistake is not reset Keyboard shortcut to default, I set it to F11, F12, now tried restore default and back to F14, F15 then working

Thank all so much!