Can't Fixing Backlight with SSDT-PNLF.

[hoaug]

Hi

 

today I try to install on my machine Monterey. everything works except the screen brightness is not adjustable. I have tried many ways:
- SSDT-PNLF prebuild from Opencore
- Self-build SSDT-PNLF
- use RehabMan's SSDT-PNFL + Rename GFX0 to IGPU

but all is not working, oh my god...

Anyone know how to fix this please help me, thank you very much.

My configuration: HP laptop

CPU: i3-7100U
MAIN: HP
RAM: 8GB
SSD: GLowy 120GB
1366x768 ( worst monitor!)

here is my EFI: 

 

https://drive.google.com/file/d/12sBnuGGFzuQq1Dh9i2B3UvXYovHBV_vh/view?usp=sharing

[Anya Baker]

try this if it can work-

Go to System Preferences > Displays and check the settings there. Ensure that "Automatic brightness" is turned off and try adjusting the brightness manually.

Resetting the System Management Controller (SMC) can sometimes help resolve issues with screen brightness. To do this, shut down your Mac, press and hold the Shift + Control + Option keys along with the Power button for 10 seconds, then release all keys and turn on your Mac.

[mnfesq]

For my HP laptop, the PNLF device is not located in the place designated in the OC prebuilt SSDT-PNLF.  For my laptop, the PNLF device works when it is located in Scope _SB, not Scope _SB_.PCI0.GFX0.   I also have a very basic PNLF code, which is included in a customized DSDT (which is old-school and not recommended anymore.). 

 

Here is the OC version of SSDT-PNLF modified to change the location where the device is inserted:

 

SSDT-PNLF.aml.zip

 

Here is the code I use made as an SSDT.  (Be sure to change the name to SSDT-PNLF)

 

SSDT-PNLF-1.aml.zip

 

Hope one of these helps.

[hoaug]

@mnfesq thank you for help me. i will try right now

@Anya Baker thank you, but i try four times but i cant make SMC reset. i think i clicked something wrong

 

[hoaug]

@mnfesq hi, i tried both of your SSDT but even though the brightness can be adjusted in control center but the screen still dark and nothing happend do I need to rename anything?

 

 

Edited May 2, 2023 by kinhhoang161

[Baio77]

https://github.com/acidanthera/WhateverGreen/blob/master/Manual/FAQ.IntelHD.en.md

 

Adjusting the brightness on a laptop

Use this ACPI table SSDT-PNLF
Table SSDT-PNLFCFL is deprecated, use updated table SSDT-PNLF from OpenCore 0.7.3+ for any Intel HD Graphics.

Certain mobile Kaby Lake, Coffee Lake and Ice Lake devices need fixing of the backlight registers. Without the fix certain devices will end in a black screen when booting macOS, like seen on the Dell inspiron 3593. The WhateverGreen backlight registers fix can be enabled using enable-backlight-registers-fix property to IGPU or using the -igfxblr boot argument.

For laptop brightness keys use BrightnessKeys.kext.

[hoaug]

@Baio77 thanks. I have successfully fixed the above error in a pretty crazy way that is using kext Appleblacklightfixup. It sounds silly, but it works. i think it's ok now. I thought it was done, but unexpectedly, I encountered a very difficult error that was:

My machine when shutdown it does not shutdown as usual. It goes into a sleep-like state. it just turns off the screen but the light stays on and the fan keeps spinning. I tried pressing the power button but it doesn't turn on. the only way is to hold down the power button to reboot to be able to enter the mac.

I tried:
- Remap the USB - I made sure I mapped the standard USB 100%. set 255 for 3 internal ports of the machine
- Use SSDT to fix Shutdown on Opencore post

and... all of it doesn't work. Is there any way to fix this. Thank you very much

[Baio77]

run ioreg and pass the log save. Describe the exact model from HP and also if it has a discrete GPU like Nvidia or AMD.

[hoaug]

@Baio77 here is my iored, my Laptop only have igpu not have dGPU. model of my laptop is hp pavilion x360 i3 7100.



jenny’s MacBook Pro.iore