1. 强行开启手动模式 (1代表手动)
   echo 1 > /sys/devices/platform/applesmc.768/fan1_manual

2. 强行写入转速为 2000 (2000转非常安静)
   echo 2000 > /sys/devices/platform/applesmc.768/fan1_output

3. 再次查看转速确认
   cat /sys/devices/platform/applesmc.768/fan1_input

如何让它每次开机都安静？

nano /etc/rc.local

#!/bin/sh -e
# 加载苹果驱动
modprobe applesmc
# 延迟5秒等待硬件就绪
sleep 5
# 强制风扇降速
echo 1 > /sys/devices/platform/applesmc.768/fan1_manual
echo 1800 > /sys/devices/platform/applesmc.768/fan1_output
exit 0

赋予执行权限：
chmod +x /etc/rc.local

重启

查看cpu温度可以安装btop。