In the linux source code for the "apple-gmux" they use the "gmux_index_write8" function for the retina models and the "gmux_pio_write8" for non retinas, and the index one is a bit more complex. They do some sort of waiting between outb instructions, and that's probably why it sometimes work, and sometimes won't. You can copy the waiting functions and give it a try.
system_profiler SPDisplaysDataType | grep gMux
gMux Version: 1.9.23
gMux Version: 1.9.23system_profiler SPDisplaysDataType | grep gMux
gMux Version: 1.9.23kextstat | grep AMD
com.apple.kext.AMDLegacySupport (1.5.8)
com.apple.kext.AMD6000Controller (1.5.8)
com.apple.kext.AMDLegacyFramebuffer (1.5.8)
kextstat | grep -i backlight
com.apple.driver.AppleBacklightExpert (1.1.0)
com.apple.driver.AppleBacklight (170.10.1)
com.apple.driver.AGDCBacklightControl (3.16.19)kextstat | grep -i backlight
com.apple.driver.AppleBacklightExpert (1.1.0)
com.apple.driver.AGDCBacklightControl (3.16.19)sudo kextload -r /AMDExtensions/ /AMDExtensions/AMD6000Controller.kext
kextstat | grep AMD
com.apple.kext.AMDLegacySupport (1.5.8)
com.apple.kext.AMD6000Controller (1.5.8)kextstat | grep -i backlight
com.apple.driver.AppleBacklightExpert (1.1.0)
com.apple.driver.AGDCBacklightControl (3.16.19)sudo kextload -r /AMDExtensions/ /AMDExtensions/AMD6000Controller.kext
kextstat | grep AMD
com.apple.kext.AMDLegacySupport (1.5.8)
com.apple.kext.AMD6000Controller (1.5.8)
> kextstat | grep -i backlight
com.apple.driver.AppleBacklightExpert (1.1.0)
> kextstat | grep -i mux
com.apple.driver.AppleMuxControl (3.14.49)kextstat | grep -i backlight
com.apple.driver.AppleBacklightExpert (1.1.0)
com.apple.driver.AppleBacklight (170.10.1)
com.apple.driver.AGDCBacklightControl (3.16.19)kextstat | grep -i backlight
com.apple.driver.AppleBacklightExpert (1.1.0)
com.apple.driver.AGDCBacklightControlkextstat | grep -i mux
com.apple.driver.AppleMuxControl (3.16.19)Installing GRUB
Follow the steps described in this guide:
https://gist.github.com/blackgate/17ac402e35d2f7e0f1c9708db3dc7a44
Installing the attached kext to prevent the GPU from waking up from sleep (optional)
WARNING: This kext should only be used with the GRUB solution in place, otherwise it will kernel panic.
The attached kext is unsigned, if you have a kext signing certificate, you can build it yourself and sign it (don't forget to share). You can find the source code here.
Mavericks
Copy the kext to /System/Library/Extensions and then run the following commands from terminal:
Code:sudo chmod -R 755 /System/Library/Extensions/AMDGPUWakeHandler.kext sudo chown -R root:wheel /System/Library/Extensions/AMDGPUWakeHandler.kext sudo touch /System/Library/Extensions
Yosemite
Copy the kext to /Library/Extensions and then run the following commands from terminal:
Code:sudo nvram boot-args="kext-dev-mode=1" sudo chmod -R 755 /Library/Extensions/AMDGPUWakeHandler.kext sudo chown -R root:wheel /Library/Extensions/AMDGPUWakeHandler.kext sudo touch /Library/Extensions
El Capitan and later
You need to have SIP disabled (view the guide to see how you can disable it).
Copy the kext to /Library/Extensions and then run the following commands from terminal:
Code:sudo chmod -R 755 /Library/Extensions/AMDGPUWakeHandler.kext sudo chown -R root:wheel /Library/Extensions/AMDGPUWakeHandler.kext sudo touch /Library/Extensions
The best thing you can do is "downgrade" to Sierra.
EDIT: also it seems that now it hangs on shutdown and never actualy does it
EDIT2: Fixed the shutdown problem. I accidentally put the Wake kext in /System/Library/Extensions
sudo shutdown -r nowsudo shutdown -h now
I have the one posted in the 1st post and it works. Would there be any differences? Is that one not signed?
Umm....I don’t think I’ve enabled SIP back
Should I?
After disabling and following the steps I just left it as is.
if loadfont /boot/grub/font.pf2 ; then
set gfxmode=auto
insmod efi_gop
insmod efi_uga
insmod gfxterm
terminal_output gfxterm
fi
set menu_color_normal=white/black
set menu_color_black/light-gray
set timeout=10
menuentry "macOS" {
insmod hfsplus
outb 0x728 1
outb 0x710 2
outb 0x740 2
outb 0x750 0
search --no-floppy --fs-uuid --set=root b296e8fd7fe7da5e
chainloader /System/Library/CoreServices/boot.efi
}
menuentry "macOS new” {
insmod hfsplus
outb 0x728 1
outb 0x710 2
outb 0x740 2
outb 0x750 0
search --no-floppy --fs-uuid --set=root aa82986e041282fd
chainloader /System/Library/CoreServices/boot.efi
}
menuentry “Recovery” {
insmod hfsplus
outb 0x728 1
outb 0x710 2
outb 0x740 2
outb 0x750 0
search --no-floppy --fs-uuid --set=root d5ca3db4a78f4dcf
chainloader /System/Library/CoreServices/boot.efi
}menuentry "Recovery" {
insmod hfsplus
outb 0x728 1
outb 0x710 2
outb 0x740 2
outb 0x750 0
search --no-floppy --fs-uuid --set=root aa82986e041282fd
chainloader /System/Library/CoreServices/boot.efi -r
}Unless you have SIP enabled you won't have any trouble inserting the kext.
Did the step 4 work without any error?Adding the AMDWakeHandler kext puts my mac into a Kernel panic