’s workaround got him back up and working again in the midst of a difficult period, regardless. It’s unclear why Apple would throttle the CPU with the battery disconnected. This ended the worst of the thermal throttling, and enabled semi-normal use of the machine. He deactivated the BD_PROCHOT signal, and also the CPU’s Turbo Boost feature. It allows fiddling with the various CPU settings of a MacBook. To get around the problem, used a tool called CPUTune. That’s because with no battery present, the MacBook would send a BD_PROCHOT signal to the Intel CPU, telling it to slow down due to overheating, even when the chip was cool. Parts were unavailable, and the MacBook wouldn’t run at full speed without a battery fitted. The problem was brought about by a failing battery in the MacBook Pro 13″ from mid-2018, which swelled up and deformed the laptop’s case. However, when was stuck in the midst of a 2020 lockdown with no parts available, he found a way to get his damaged MacBook up and running without a battery. A long time ago, a laptop was a basic thing, and you could pretty much run one just by hooking up a power supply to the battery contacts.
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