Two questions:
- How to bind hot key so that there would have volume sound display on screen?
- How to bind hot key so that brightness would also display on screen?

My i3 config for sound volume and brightness is

The problem is configuration for sound works but there is no display. And for 
brightness, xbacklight -inc N or xbacklight -dec N returns message

    No outputs have backlight property

I read that's because xbacklight can't find the corresponded backlight in 
/sys/class. I am aware that changing the value at 
/sys/class/backlight/intel_backlight works, but I am looking for somewhat more 
portable way.

i3-wm 4.13-1
debian 9.3


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