[arch-general] Backlight Brightness Indicator in LXDE

[naicam|ne]

My temporary band-aid solution was to install xfce4-power-manager which 
has a slider in the status icon menu, so now I can set it (not really a 
feature I want or need, but has some utility) or just check it from 
there. It works for now. I'm still looking. It also allowed me to remove 
the power manager I had installed, and wound up using marginally less 
space, with fewer dependencies.

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