Failed to start Load/Save Screen Backlight Brightness of amdgpu_bl0报错导致屏幕亮度无法保存

环境

CPU：AMD-4750U
系统：Manjaro20 KDE

解决方法

解决方案原网址：https://www.linux.org/threads/failed-to-start-load-save-screen-backlight-brightness-of-amdgpu_bl1.31998/

1、编写一个开机启动服务

sudo vi /etc/systemd/system/startup_brightness.service

文件内容如下所示：

[Unit]
Description=Dummy service for attempting to start the problematic amdgpu_bl0 service

[Service]
Type=oneshot
ExecStart=systemctl start systemd-backlight@backlight:amdgpu_bl0

[Install]
WantedBy=multi-user.target

2、让服务开机启动

sudo systemctl enable --now startup_brightness

关机重启，屏幕亮度能够自动保存