From 0a04c5c1564fb241c2351fc10046e41050fc7639 Mon Sep 17 00:00:00 2001
From: Mykola Grymalyuk <48863253+khronokernel@users.noreply.github.com>
Date: Sun, 16 May 2021 11:31:52 -0600
Subject: [PATCH] Enable Brightness MBP8,x

---
 Resources/SysPatch.py | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/Resources/SysPatch.py b/Resources/SysPatch.py
index abba5790c..ed68d0e56 100644
--- a/Resources/SysPatch.py
+++ b/Resources/SysPatch.py
@@ -127,11 +127,26 @@ class PatchSysVolume:
                 #    print("- Merging legacy Nvidia Kepler Kexts and Bundles")
                 #    self.add_new_binaries(ModelArray.AddNvidiaKeplerAccel11, self.constants.legacy_nvidia_kepler_path)
             elif dgpu_vendor == self.constants.pci_amd_ati:
-                if dgpu_device in PCIIDArray.amd_ids().terascale_1_ids or dgpu_device in PCIIDArray.amd_ids().terascale_2_ids:
+                if dgpu_device in PCIIDArray.amd_ids().terascale_1_ids:
                     print("- Merging legacy AMD Kexts and Bundles")
                     self.delete_old_binaries(ModelArray.DeleteAMDAccel11)
                     self.add_new_binaries(ModelArray.AddGeneralAccel, self.constants.legacy_general_path)
                     self.add_new_binaries(ModelArray.AddAMDAccel11, self.constants.legacy_amd_path)
+                if self.model in ["MacBookPro8,2", "MacBookPro8,3"]:
+                    # This is used for MacBookPro8,2/3 where dGPU is disabled via NVRAM and still requires AMD framebuffer
+                    # For reference:
+                    #- deMUX: Don't need the AMD patches
+                    #- dGPUs enabled:  Don't install the AMD patches (Infinite login loop otherwise)
+                    #- dGPUs disabled: Do need the AMD patches (Restores Brightness control)
+                    dgpu_status: str = subprocess.run("nvram FA4CE28D-B62F-4C99-9CC3-6815686E30F9:gpu-power-prefs".split(), stdout=subprocess.PIPE, stderr=subprocess.STDOUT).stdout.decode()
+                    if dgpu_status.startswith("FA4CE28D-B62F-4C99-9CC3-6815686E30F9:gpu-power-prefs	%01"):
+                        print("- Detected dGPU is disabled via NVRAM")
+                        print("- Merging legacy AMD Kexts and Bundles")
+                        self.delete_old_binaries(ModelArray.DeleteAMDAccel11)
+                        self.add_new_binaries(ModelArray.AddGeneralAccel, self.constants.legacy_general_path)
+                        self.add_new_binaries(ModelArray.AddAMDAccel11, self.constants.legacy_amd_path)
+                    else:
+                        print("- Cannot install Brightness Control, pleas ensure the dGPU is disabled via NVRAM")
         if igpu_vendor:
             print(f"- Found IGPU: {igpu_vendor}:{igpu_device}")
             if igpu_vendor == self.constants.pci_intel: