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[Guide] Patching DSDT/SSDT for LAPTOP backlight control

I was able to get the brightness slider in preferences (and brightness keys working) by only using the Brightness fix patch on DSDT. I haven't installed the IntelBacklight.kext.
What exactly does it do? Why does my brightness work in preferences without it?

You will not have full range of brightness (and likely a different range before/after sleep/wake cycle) without IntelBacklight.kext.
 
Reading through this guide it seems to be only for iGPU. Is there any advice you have for a locked in GPU like the GTX980M?
There is no brightness slider in SysPrefs->Display and I doubt a DSDT edit for iGPU would apply to a discrete GPU.
 
Reading through this guide it seems to be only for iGPU. Is there any advice you have for a locked in GPU like the GTX980M?
There is no brightness slider in SysPrefs->Display and I doubt a DSDT edit for iGPU would apply to a discrete GPU.

I have no experience with Nvidia or AMD graphics on laptops.
You might try just "Brightness Fix" to see if the native backlight controls (AppleBacklight.kext) work.
 
hi RehabMan, i was control brightness with Fn key (ALPS touchpad kext), but when apply patch PNLF_Sandy/ivy add Brightness slider > logon blackscreen error :(
 
hi RehabMan, i was control brightness with Fn key (ALPS touchpad kext), but when apply patch PNLF_Sandy/ivy add Brightness slider > logon blackscreen error :(

Did you forget to install IntelBacklight.kext? (and correct patch is "Brightness Fix").

If you need analysis, read post #1, "Problem Reporting"
 
Did you forget to install IntelBacklight.kext? (and correct patch is "Brightness Fix").

If you need analysis, read post #1, "Problem Reporting"
i was install intelBacklght.kext and apply patch graphics_PNLF_ivy_sandy.txt, but stuck error
 
i was install intelBacklght.kext and apply patch graphics_PNLF_ivy_sandy.txt, but stuck error

Boot verbose, show photo. Attach EFI/Clover folder as ZIP (omit 'themes' folder).

Also, boot safe mode, then:
Attach output of (in Terminal):
Code:
sudo touch /System/Library/Extensions && sudo kextcache -u /
 
Boot verbose, show photo. Attach EFI/Clover folder as ZIP (omit 'themes' folder).

Also, boot safe mode, then:
Attach output of (in Terminal):
Code:
sudo touch /System/Library/Extensions && sudo kextcache -u /
here, thank u your support !
 

Attachments

  • EFI.zip
    596.4 KB · Views: 94
The DSDT in ACPI/patched has not had "Brightness Fix" patch.

You did not provide kextcache output as requested.
i can't capture in verbose mode
 
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