Fn+Fx背光调节失败，如何修复

[ziyuanjun]

Manjaro 安装完成后无法通过 Fn+F5/F6调节背光强度。

[ziyuanjun]

解决方法1——手动调节背光强度：
xrandr
输出：

Screen 0: minimum 8 x 8, current 1366 x 768, maximum 32767 x 32767
eDP1 connected primary 1366x768+0+0 (normal left inverted right x axis y axis) 290mm x 160mm
1366x768 60.11*+ 48.02
1280x720 59.86 60.00 59.74
1024x768 60.00
1024x576 60.00 59.90 59.82
960x540 60.00 59.63 59.82
800x600 60.32 56.25
864x486 60.00 59.92 59.57
640x480 59.94
720x405 59.51 60.00 58.99
680x384 60.00
640x360 59.84 59.32 60.00
DP1 disconnected (normal left inverted right x axis y axis)
DP2 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)

修改亮度：
xrandr --output eDP1 --brightness 0.5
最后的数值为0-10之间，小于1为降低亮度

参考：

1. https://blog.csdn.net/caigen0001/article/details/97011000
2. https://blog.csdn.net/hanjushi2/article/details/82120707