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2.2 GHz (Turbo Boost up to 3.4 GHz), 2.5 GHz (Turbo Boost up to 3.7 GHz), or 2.8 GHz (Turbo Boost up to 4.0 GHz) quad-core Intel Core i7 processor with 6 MB shared L3 cache and an optional AMD Radeon R9 M370X dGPU.

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MacBook Pro glitching and artefacting

Hi all, I have this 2015 MacBook Pro that currently doesn’t boot most of the time, but it will occasionally but usually crashes soon after and reboots, it is the dGPU model. I am trying to just disable it in Recovery but I can’t boot into recovery as it commonly crashes before finally booting into recovery, or shows what is in my image. Is there any way to disable the dGPU or boot into Recovery to do such like with OpenCore Legacy Patcher as I am unable to actually disable the dGPU and even Recovery mode stresses the GPU enough for it to crash and I am unable to use Single User Mode as I am on Big Sur. Does anyone have any ideas on how I can disable the dGPU and what issues will arise from doing this on a 2015 model, as I am not familiar with these 2015 MBP GPUs dying, is it common?

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The trick is to get into Safe Mode which disables the GPU driver so the Intel Graphics Engine is used alone. But I'm not sure if the AMD GPU is your issue. Are you even able to run the onboard Diagnostics? Reboot the system and press the D key are you able to get it to run cleanly?

As far as this AMD GPU failing, it was more robust over the older 2011~2014 models. But even still newer Applications (Gaming being the biggest) kept pushing the GPU's further to the edge of the point of failure, the heat buildup couldn't be taken away fast enough.

Given the pattern I'm suspecting the GPU's dedicated RAM has an issue. Which would be a blown RAM chip or the solder joints have failed.

So... Are you able to enter Diagnostics? Did any errors pop? If it was clean both within the display and diags then let's try Safe Mode. Restart the system again now press the Shift (⇧) key that should boot up cleanly as the AMD chips driver is not loaded. While you can't do much as most of the needed peripheral drivers are likewise not loaded you still should run without a crash. Locate the Crash Logs reviewing them should tell you what is the cause of the crashes Reviewing the Crash Logs you likely have a deep pile, you may want to delete it and then create a fresh event to have just one report.

Let's see what you discover, post the log output in a landscape PDF file here so we can review it as well.

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I did briefly try Safe Mode and it did load but then the Apple logo disappeared and I just had the display backlight, although the trackpad could still click, the MacBook was unresponsive. Another thing was I tried Recovery Mode again and after the 5th try, it worked but then the Apple logo began glitching all over the screen and scaling all over, then it did the same thing with the blank screen just backlight and unresponsive. Does this sound like a VRAM issue? I’ll get back to you about Safe Mode and Diagnostics once I’ve slept and I have free time to look into this again, thanks a bunch

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