![]() ![]() This gave me a MBP which could boot to OS X although STILL using a broken AMD GPU: so it screen's image is very distorted (could browse the Internet but quite inconvenient to read a text), Launchpad is super laggy, and you can't switch to Integrated GPU using gfxCardStatus because: without AMD drivers (which we had to remove to successfully boot to OS X) Macbook Pro thinks its' internal screen is External Display and gfxCardStatus tells it is impossible to switch because External Display is using AMD GPU. Then I performed these "1)-7)" steps you see above, and also repaired a filesystem by running sudo fsck.hfsplus -f /dev/sdb2 before unmounting a partition with sudo umount /mnt and putting a hard drive back to MBP. (1st answer) - carefully executed a number of commands, calculated a sizelimit for my parition layout, and finally ran sudo mount -t hfsplus -o force,rw,sizelimit=YOURNUMBER /dev/sdb2 /mnt to mount this HFS+ partition to /mnt directory in read-write mode. In my case it was even more difficult because the OS X partition became a "read-only" partition (because of too many emergency shutdowns I did while desperately trying to boot OS X with a failed GPU) so I had to remove a hard drive from MacBook Pro and (using a USB to SATA 2.5" adapter taken from my portable HDD) attached it to a computer with Linux, then followed these instructions: The degree of your inconvenience while doing these steps - strongly depends on how heavily a screen's image is distorted in your case. But I don't like investing money to the old computers, so I have thought - what if there is some hack to force MBP to use integrated graphics ALL THE TIME, even while booting ? And then started to explore the possible solutions.įirst of all, it is possible to successfully boot a MBP to OS X while still using the failed GPU, after you remove the AMD drivers by booting in command line mode ( CMD+S) and entering these commands:Ģ) mount -uw / (mount a root filesystem with read/write permissions)ģ) sudo mkdir /AMD_Kexts/ (make a directory to store the AMD drivers in case you'll need them in future)Ĥ) sudo mv /System/Library/Extensions/AMD*.* /AMD_Kexts/ (move the AMD drivers)ĥ) sudo rm -rf /System/Library/Caches// (remove the AMD drivers cache)Ħ) sudo mkdir /System/Library/Caches// (just in case OS X will be dumb and will not recreate this directory, I am creating it for OS X)ħ) sudo touch /System/Library/Extensions/ (to update the timestamps so that new driver caches - without AMD drivers - will be definitely rebuilt)Ĩ) sudo umount / (umount a partition to guarantee that your changes are flushed to it) ![]() But it finally broke down last week: laptop's screen image became distorted, it refused to boot OS X (always freezing half-way), and - Apple free repair program has already ended! I know there are affordable solutions like $50 BGA resoldering at unofficial local repair shop and that its possible to get a new replacement HD 6750M chip from AliExpress for $35 or cheaper ( or, because don't know if this is true - ) to guarantee a successful repair, so the total price of repair would be either $50 or $50+$35=$85 - less than $100 in any case. It has been working perfectly for 6 years under quite a high load, even tried mining at background! So I was confident that my MBP is not affected by bad solder / bad soldering quality and didn't want to bring it to Apple for a free repair program - partially because couldn't find the time to pause my important software projects, partially because I was afraid that Apple might give me a less reliable logic board or refuse a free repair because of the several unrelated repairs that I did manually by myself earlier to save money: changed thermal paste a few times, replaced the internal battery 2 times, replaced a keyboard with broken buttons, etc. If you don't have time to read my story (which also describes some interesting technical approaches) just scroll down this thread until a "100% WORKING SOLUTION" textĭiscrete AMD GPU of my 2011 MacBook Pro 8,2 has finally failed because of the reasons mentioned here ( ) and there ( ). ![]()
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