Andrew, it seems `lxqt-config-brightness -d` should decrease the brightness and 
`lxqt-config-brightness -i` should increase it. Media keys 
XF86MonBrightnessUp/Down and Shift+Control+F6/7 are set in `lxqt-globalkeysd` 
to call these commands. It seems there is no option through 
`lxqt-config-brightness` to adjust the backlight. There is 
`lxqt-backlight_backend --inc/dec`, but it requires elevated permissions:
https://askubuntu.com/questions/1093862/lubuntu-brightness-backlight-issue

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https://bugs.launchpad.net/bugs/1829641

Title:
  brightness keys on laptop don't dim the backlight

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