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External keyboard backlight problem

tl flag

I tried to turn on my external keyboard's backlight using the commands (xset led on, xset -led 3 then xset led 3) on Ubuntu 22.04, and these commands are not working.

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sa flag

If a value between 1 and 32 is given, that LED will be turned on or off depending on the existence of a preceding dash. xset led 3 would turn led #3 on. xset -led 3 would turn it off. The particular LED values may refer to different LEDs on different hardware.

Example using led 3:

xset -led 3 # turn backlight off
xset led 3 # turn backlight on

This would work if the device number of your keyboard's backlight is 3, otherwise try a different number between 1 and 32.

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