With the (discontinued) MacBook, Apple initiated a transition to ports Thunderbolt 3 / USB-C that there was no turning back. Currently, both available notebooks (MacBooks Air and Pro) have only this type of connection, something positive and negative, depending on the analysis angle.
Among the advantages, it is possible to recharge these machines from any of the available ports (which are actually Thunderbolt 3, but follow the USB-C standard); however, a recent discovery states that plugging the power adapter into the ports on the left can make the device superaquea, as disclosed by iMore.
Before going into the details, it is worth noting that the following tests were performed on a 15-inch MacBook Pro (2017), with similar implications seen on 13-inch models (with four Thunderbolt 3 ports) and even in the latest version, from 16 inches.
According to the analysis, published on StackExchange, the increase in temperature on the MacBook is not only due to the fact that the charger is connected to a port on the left side; for this, it is necessary to have another accessory connected to the machine, on the same side.
To control the high temperature generated (naturally) by connecting an accessory, MacBooks have sensors on both sides that manage them, in which case the problem directly interferes with a CPU process called kernel_task.
For some reason, macOS “ignores” the machine's temperature control when the device is being recharged through a port on the left side and there is also another accessory connected on the same side. In a matter of minutes, the device heats up and activates the computer's fans, with CPU usage skyrocketing.
The high CPU usage by the kernel_task determined by the Thunderbolt's proximity temperature sensor, caused by loading and connecting peripherals at the same time.
However, when the charger is moved from the ports on the left to the ports on the right, the temperature drops and the kernel_task stops working in less than 15 seconds with the CPU running whenever the charger is reconnected to the ports on the left.
The solution offered at StackExchange will leave any peripherals connected on the left and the charger on the right. Connecting everything from the right can also lead to temperature spikes, with the fans accelerating to neutralize the heating although the kernel_task crash does not happen.
Apple has not yet officially commented on the case, but it is likely that the problem can be solved with a software update to correct the use of the heating sensors.
tip from Jeadilson Bezerra