大家好，在我的笔记本电脑中，我在 kde 或 gnome 中更改了亮度设置，按下键盘上的设置键后，屏幕循环显示低亮度和高亮度，并且不起作用
tux-world@alachiq ~ $ lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)
tux-world@alachiq ~ $ xrandr --output LVDS --set BACKLIGHT 102 --set BACKLIGHT_CONTROL legacy --output VGA --auto
warning: output LVDS not found; ignoring
warning: output VGA not found; ignoring
X Error of failed request: BadRROutput (invalid Output parameter)
Major opcode of failed request: 150 (RANDR)
Minor opcode of failed request: 15 (RRGetOutputProperty)
Serial number of failed request: 30
Current serial number in output stream: 30
此命令不返回任何结果：
tux-world@alachiq ~ $ xbacklight -inc 10
kde 亮度全部设置为100%