If there is such a variable, its better to remove it with rm. If everything is done correctly, you will find yourself at the Linux console! (It takes some time so be patient and wait for the prompt)Ģ.2) Edit EFI vars: looks like efivarfs filesystem is mounted by default! So you can already cd /sys/firmware/efi/efivars and ls to explore this directory and see if there is a "gpu-power-prefs-." variable (where. Step 2) Boot to Linux (Credits to AppleMacFinder):Ģ.1) Boot to it: insert this CD/DVD/USB to Macbook Pro, hold Option key while booting, choose "EFI boot" (that is your bootable installation media), press " e" key to edit the GRUB options of the Arch Linux archiso x86_64 UEFI CD menu entry while it is selected at the main screen, add nomodeset to the end of this line and press Enter. *) sudo dd if=path/to/arch.iso of=/dev/ rdiskX bs=1mĪfter completion, macOS may complain that "The disk you inserted was not readable by this computer". The dd command is similar to its Linux counterpart, but notice the 'r' before 'disk' for raw mode which makes the transfer much faster: Now copy the ISO image file to the device. Verify that this is the device you want to erase by checking its name and size and then use its identifier for the commands below instead of /dev/diskX.Ī USB device is normally auto-mounted in macOS, and you have to unmount (not eject) it before block-writing to it with dd. Your USB device will appear as something like /dev/disk2 (external, physical). Open /Applications/Utilities/Terminal and list all storage devices with the command: iso:įirst, you need to identify the USB device. Then you could either simply burn this ISO to CD/DVD (which later could be either inserted to MBP's SuperDrive or External DVD Drive connected to MBP by two USB cables) or create a bootable USB: use the great detailed instructions from this page, ġ.2) Creating the bootable USB with the. Download the latest Arch Linux ISO image from this page -, at the time of writing it is archlinux-2017.03.01-dual.iso. You need a working computer for that and a spare CD/DVD/USB drive. Step 1) Prepare a Bootable USB pendrive with a non GUI Linux (Credits to AppleMacFinder) Just buy one of those cheap usb to sata connectors and use it to connect it to another Mac so you don’t risk having your installation failed because of your machine. Note: You might need to do this on another computer. Select the Sierra installer and proceed with the installation (I format the HDD partition to make a clean install on it) Step 0) As a starting point I made a clean installation of Sierra (Version 10.12.4) - This is just a step for establishing a common middle ground and is not really needed….Ġ.1) To do this just download the installer from the App Store and then use “DiskMaker X” to create a bootable installation.Ġ.2) After the bootable image is created, proceed to turn off your computer and hold the “Alt” or “Options” Key. This guide is based on the experience of many users (including me) while trying to fix the very well known issue with AMD dGPU on 17’’ MacBook Pro from 2011 (both early and late): (Tested successfully in both “early” and “late” 2011 17 inch MacBook Pro) ![]() If yes, then maybe you'd either have to replace a hard drive (if its' indeed broken) or reinstall OS there ![]() you'd try booting your Mac from ArchLinux USB drive again - with nomodeset parameter of course - and see if that works. the hard drive died or its' OS X filesystem got corrupted. However, if that doesn't help, maybe there is another problem with your Mac: e.g. That should discharge the elements of your MBP and all the volatile memory should be reset - and that includes the "efivars memory" It should have reset all your efivars! But if you believe that for some reason this doesn't reset the efivars in your case, you could try the following: disconnect a charger and also disconnect a battery from your MBP's motherboard (could do that even without a special screwdriver, removal a battery from MBP's case is not required), then carefully press and hold a power on button, maybe for 1 minute just in case, then assemble everything back. Click to expand.> Resetting the PRAM and SMC has no effect
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