This is a quick way for 2FA authorization. The fingerprint sensor on the power button gets hidden.The Macbook emits heat through the keyboard and upper surface, which gets worse with closing the lid, and still might lead to overheating effects.Default usage for the Radeon GPU with built-in and external display is ~16W.Ĭlosing the lid is called Clamshell mode thus requiring external keyboard, trackpad, etc.Īlthough this method saves energy, I don't like it for these reasons: I did not try HDMI or display-port yet (problems with adapters detecting the external display, USB-C worked best).Ĭlosing the lid can make a difference, with one display less to render. I'm using USB-C to USB-C where the ultrawide 3440x1080 (1440p) Samsung monitor also provides 65W power drain. The connection ports for the display/charging did not make a difference in my tests. Older community threads mention that charging on the right side are better. I've experimented with switching 60 to 100 Hz for the external monitor with no improvements.Ħ0Hz stays at ~16W, while 100Hz increase AMD GPU power usage 19W. There's numerous discussion threads about different refresh rates. I'm hesitant in changing OS settings on the kernel level which may break future upgrades. Thus far, I've only used the suggested Turboboost Switcher for monitoring the temperature and fan speed. This drains more power and produces more heat, and it could negatively influence the behaviour of the external monitor temperature problem. Intel uses Turboboost to overclock the processor, 2.6GHz boosted to 4.5GHz. The 2019 Macbook therefore got better fans to address heat concerns. The planned 10nm had to be postponed, and is not available in the Macbook. When looking up the specs for the Core i7 version, it unveils 14nm for the chip. That means when kernel_task is on the top activity list, your system is actually consuming too many CPU cycles. One of the OS tasks is to schedule low resource tasks to throttle the CPU, it would otherwise overheat. The kernel_task process seems to consume lots of resources. $ sudo powermetrics -samplers smc | egrep -i "Fan|CPU die"
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