Ubuntu18.04 cpu温度过高-kworker占用cpu

背景

日常开发用笔记本, ubuntu18.04, 风扇呼呼转, 吵得很.

就算啥也不干, cpu温度也维持在 75°以上. 参考资料报告这是Ubuntu18的一个bug,后续版本已修复

检查cpu占用, 一个 kworker 进程的cpu占用一直维持在 90% 左右.

解决办法

# 先切 root 用户
echo "disable" > /sys/firmware/acpi/interrupts/gpe6F

(这个语句再次执行会报错)

看看效果. cpu温度维持在 45° 以下

这个命令不是永久的, 重启后失效

把指令配置为开机启动

Ubuntu18 使用 systemd 管理开机服务,这里写的 rc.local 脚本还要用 systemd 管理

sudo vim /etc/rc.local

#!/bin/bash
# 用户手动创建的开机执行的命令

# fix kworker cpu load high
echo "disable" > /sys/firmware/acpi/interrupts/gpe6F

sudo chmod +x /etc/rc.local

sudo vim /etc/systemd/system/rc-local.service

#  SPDX-License-Identifier: LGPL-2.1+  
#  
#  This file is part of systemd.  
#  
#  systemd is free software; you can redistribute it and/or modify it  
#  under the terms of the GNU Lesser General Public License as published by  
#  the Free Software Foundation; either version 2.1 of the License, or  
#  (at your option) any later version.  

# This unit gets pulled automatically into multi-user.target by  
# systemd-rc-local-generator if /etc/rc.local is executable.  
[Unit]
Description=/etc/rc.local Compatibility
Documentation=man:systemd-rc-local-generator(8)
ConditionFileIsExecutable=/etc/rc.local
After=network.target

[Service]
Type=forking
ExecStart=/etc/rc.local
TimeoutSec=0
RemainAfterExit=yes
GuessMainPID=no

[Install]
WantedBy=multi-user.target

重新加载配置
sudo systemctl daemon-reload

启动服务
sudo systemctl start rc-local.service

设置开机启动
sudo systemctl enable rc-local.service

参考

• 解决Ubuntu18.04中启动kworker等占用系统cpu过高问题
• launchpad: kworker process starts at 85% of cpu and stays there
• askubuntu: Ubuntu 18.04 cannot boot