Screen luminosity control

By using Cairo dock, I found an interesting option, luminosity control. I don’t know, if that is used in modern Linux distros, for I had a problem of getting the fonts to look sharp. Lowering the backlight only made the screen dimmer. Rediscovering the Cairo dock (after more than 5 years), got me to this interesting plug-in, screen luminosity control. Everything on screen looks sharper now. Is there any other way to do this, that is, through the terminal? Laptop’s screen backlight buttons work separately.

gamma_control

https://bbs.archlinux.org/viewtopic.php?id=146596

https://wiki.archlinux.org/index.php/font_configuration

Is there an XFCE version of this?

It’s cairo dock. It works on most any DE.

1 community/cairo-dock 3.4.1-4 (1.4 MiB 5.7 MiB) 
    Light eye-candy fully themable animated dock

I already have dockbarx so would prefer not to use cairo

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Is there a luminosity control in dockbarx?