This setup has now one kext in a place Apple’s installers do not expect. Now I just going to copy paste from MikeyN’s post Now, boot into recovery single user mode by holding: cmd + R + S. Try to do the following step just right after, so you don’t let the computer to load -and fail. PRAM/NVRAM: with the power cord on, power on and immediately later and before the chime hold cmd + Opt/Alt + P + R at the same time until you hear the chime for the second time.SMC: shutdown, unplug everything except power, now hold leftShift + Ctrl + Opt/Alt + Power for about 10” and release at the same time.As always you have to reset SMC and PRAM/NVRAM before you do anything else.I’ve just changed somethings and added the AMDGPUWakeHandler to manage the sleep. This guide is almost a exact copy of the one posted by MikeyN here. We all have to thank to MacRumors community that all of them have been working really hard to create a workable solution to all of us. You can check my previous post also 1 & 2. Till this moment this is my favorite solution and I even have the brightness back to my computer. Ok!!!!!! There is a third, and I think final, solution to totally deactivate the dGPU. Update 2019.10.20-22.10 EEST: I don’t have this computer anymore, so I’m sorry but probably I’m not going to be able to help you. Update 2018.01.21-09.20 EET: I just installed macOS update 10.13.3 and after testing a little bit I got to the conclusion that what work best for me is to set pmset -a gpuswitch 1 But I don’t know if it’s really that or it’s other thing. I changed to 0 and then to 2 again, and seems that everything is normal again. I really don’t know what is the reason, but seems it’s related to the gpuswitch parameter. Also the computer didn’t turn off and got stuck in a black screen. Everything worked fine, but on wake up of hibernation I got a black screen a couple of times. Update 2018.01.09-21.35 EET: After install the security update to mitigate the effects of Spectre, I have to apply the fix again as explained here. Update 2017.12.18-14.42 EET: I’ve tried to wake up from hibernation without gxfCardStatus and it worked pretty well I didn’t have any issue, so if you don’t want to have it installed or at least running in the background I think it’s OK. I’ve updated steps 11 and 12 in consequence. gfxCardStatus can help since the problem after wake up is the dGPU activates and the computer freezes.pmset gpuswitch option can help, but it’s really undocumented officially, so we really don’t know what the values for 0, 1 and 2 stand for, and can vary from machine to machine I guess, or at least to macOS version to version.You don’t use AMDGPUWakeHandler with this solution, since it could create a kernel panic… so for that reason doesn’t work. Update 2017.12.13-09.08 EET: After checking about the wake up problem after sleeping / hibernating with the people form MacRumors, I reached some conclusions. Depending on if I have AMDGPUWakeHandler on or off I get different outputs, but none of those end in a successful wakeup. The system uses discrete graphics for simple 2D rendering.Update 2017.12.12-14.20 EET: whether or not I use the AMDGPUWakeHandler and whether I sleep or hibernate I can’t wake up of the hibernation/sleep. The system should use the integrated graphics for simple 2D rendering. The system switches immediately to discrete graphics, this might be monitored with the gfxCardStatus app STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :ģ. There are some bugs related to this marked as fixed, but tested with version 1.8.0_112 it does not seem to work: When this option is present in a special launcher of a Java program, this system as expected, the integrated graphics is used. This behaviour might be circumstanced by specify a special option in the ist file of the environment: NSSupportsAutomaticGraphicsSwitching This results in overheating and overpowering even if the app is not using any extending graphics features. When starting any Java application via command line or simply jvisualvm the system immediately switches to discrete graphics. Java HotSpot(TM) 64-Bit Server VM (build 25.112-b16, mixed mode) Java(TM) SE Runtime Environment (build 1.8.0_112-b16)
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