It was on the StackExchange platform that the initial survey was developed. Several owners of MacBook Pro have indeed discussed the fact that their machine could sometimes enter an excessive operating mode. The latter symptom is an acceleration of the fan speed, an increase in the processor load and inevitably an increase in the temperature of the assembly, case and components. It also has the consequence of creating a kernel_task task visible in the Activity Monitor on macOS, pumping all the CPU power.
And all this is clearly not good, nor for the performance of the MacBook Pro, which in this kind of case is forced to lower the frequency of its CPU to limit temperature increases, nor for the life of the components and in particular the battery, which hardly appreciates the hot weather.
The cause ? Charging port
This specific excessive operation would only occur during recharging. In fact, users of the StackExchange platform concerned by the problem highlighted that by choosing a USB charging port on the right edge instead of a port on the left edge, there were no more malfunctions to report.
Charging your MacBook Pro in one of the two USB ports on the left edge would cause the heating to be too great for components close to the charging port. The machine detecting this rise in temperature would go into this “panic” mode with fans at full speed and lowering of the CPU power to limit heat peaks.
But by loading without MacBook Pro on one of the two USB ports of the right edge, according to the tests seen in source and the returns, the fans would remain at a normal speed of rotation, the task kernel_task would not appear on macOS and the CPU would keep an average operating temperature.
Notice to all owners of MacBook Pro 4 Thunderbolt ports. Even if it is likely that the problem affects only a handful of users, it therefore seems safer and safer for your machine to charge it on one of the two ports on the right edge rather than the left .
Do not hesitate to testify in the comments if you too have noticed such a phenomenon on your computer.