[Guide] Patching DSDT/SSDT for LAPTOP backlight control

[Jingu]

I'm using the IntelBacklight.kext + Brightness Fix

In addition, I've modified 2 Methods according to safar46's Asus ROG G551/552 guide: [Guide] Asus ROG G551/552, GL551/552 Series (Skylake, i7-6700HQ, HD 530) Using Clover UEFI

      Method (_Q0E, 0, NotSerialized)
        {
            If (ATKP)
            {
                \_SB.ATKD.IANE (0x20)
            }
           ----code continues---
        }



      Method (_Q0F, 0, NotSerialized)
       {
             If (ATKP)
            {
                 \_SB.ATKD.IANE (0x10)
            }
           ----code continues-----
       }

I've remapped the brightness keys to be F5 and F6. Brightness keys F5 and F6 work perfectly on my 4K UHD screen. (Also using AsusNBFnKeys.kext)

Now, the problem is that brightness level always starts at about 85%. My preference is to have the brightness level at about 70%. I keep having to bring down the brightness after every reboot.

Is there a way to change the default brightness level?

 

[Demonbane]

ACPI is not patched per guide. Often, brightness keys do not trigger EC queries unless the DSDT is coded to simulate a version of Windows (and sometimes, a specific version). Requires one of the "OS Check Fix" patches.

See guide: http://www.tonymacx86.com/threads/guide-patching-laptop-dsdt-ssdts.152573/

I Patched those 3 OS Check Fixes, but keys are still not able to be captured.

 

[RehabMan]

I'm using the IntelBacklight.kext + Brightness Fix

In addition, I've modified 2 Methods according to safar46's Asus ROG G551/552 guide: [Guide] Asus ROG G551/552, GL551/552 Series (Skylake, i7-6700HQ, HD 530) Using Clover UEFI

      Method (_Q0E, 0, NotSerialized)
        {
            If (ATKP)
            {
                \_SB.ATKD.IANE (0x20)
            }
           ----code continues---
        }



      Method (_Q0F, 0, NotSerialized)
       {
             If (ATKP)
            {
                 \_SB.ATKD.IANE (0x10)
            }
           ----code continues-----
       }

Not sure what you're trying to show there...

Brightness keys are covered in post #1.

I've remapped the brightness keys to be F5 and F6. Brightness keys F5 and F6 work perfectly on my 4K UHD screen. (Also using AsusNBFnKeys.kext)

It is not the mechanism used by this guide.

Now, the problem is that brightness level always starts at about 85%. My preference is to have the brightness level at about 70%. I keep having to bring down the brightness after every reboot.

Is there a way to change the default brightness level?

Read post #1, "Problem Reporting".

 

[RehabMan]

I Patched those 3 OS Check Fixes, but keys are still not able to be captured.

It is wrong to apply all three. Use only one.

Read post #1, "Problem Reporting".

 

[Demonbane]

It is wrong to apply all three. Use only one.

Read post #1, "Problem Reporting".

Thanks! I just applied OS Check Fix Windows 8, now it's working!

Thank you so much RehabMan

 

[dejanu55]

I can't save my DSDT If I apply the "brightness fix" patch , I get this error: Object not found or not accesible from scope (^^_DOS)

 

[RehabMan]

I can't save my DSDT If I apply the "brightness fix" patch , I get this error: Object not found or not accesible from scope (^^_DOS)

The "Brightness Fix" patch has no reference to _DOS. You must be using the wrong patch. Please read post #1 carefully.

 

[dejanu55]

Nope , I used haswell patch for intel i7 haswell

 

[RehabMan]

Nope , I used haswell patch for intel i7 haswell

That patch can work, but you would need to read the comments in the patch to use it properly...

But all you need is "Brightness Fix" + IntelBacklight.kext. Read the guide carefully.

 

[michael1989]

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?