The keyboard stopped working 3-4 years ago from very minor water damage, but was not an original keyboard anyway. Apple System Diagnostic tool that runs by holding Option+D gave no errors. I know that the process completed successfully because the fan speeds have returned to normal before the tool rebooted the computer.ĩ. I don't have a working internal keyboard attached to the computer, so I have done the reset by using rEFIt and correct SMC files downloaded from Apple website. I have done the SMC and PRAM resets while trying to fix this issue. Happens both on OS X and Windows 10 Bootcamp with the same throttling signature.Ĩ. The issue is _below_ operating system level. The performance is at nominal levels on battery.ħ. If I run the intensive applications without charger being connected, the computer is able to draw around 90W from the battery without any issues. This happens regardless of battery charge status. As soon as the computer starts drawing around 30W+ from the charger (according to iStats 'DC In'), the throttling happens and the power draw sharply drops. The issue _only_ happens when the charger is connected to the computer. The CPU clock frequency is quickly reduced to 1.2 GHz and GPU clock frequency is reduced to 270 MHz from 775 MHz.Ħ. The issue manifests itself in a few seconds after computer power draw increases. The fans are running at an aggressive curve where they reach 100% at 65C using MacsFanControl. Regardless, the fans are completely clean and the pathways for airflow are completely open at the moment. Thermal throttling for this model happens around 90C+, I have experienced it before when the fans were clogged. The issue happens when CPU and GPU temperature is below or around 60C. The issue is _not_ related to thermal throttling of CPU and GPU. It can be emptied and fully charged properly.Ĥ. It is at 14 cycles, the computer works for hours on battery without any issues. The battery is not original, purchased relatively recently and is made by a company called EGOWAY.ģ. I think the cable might have shorted back then (which is how I noticed it), but this was 6+ years ago.Ģ. I am using an 85W original Apple charger which was purchased around 3-4 years ago, after the old one broke down due to classic cable issue. playing games which use GPU intensively.ġ. Recently, I noticed some heavy performance throttling when the computer needs to draw a lot of power - e.g. The computer is pretty beaten-up, but it still works. I have an issue with my Mid-2012 Macbook Pro (non-Retina).

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