lxqt-config-brightness: no choice not info on which monitor the brightness is tuned

[papoteur-mga]

Expected Behavior

Action of the keys acts on laptop's monitor backlight.

Current Behavior

My configuration is a laptop with an additional monitor connected through HDMI.
When I use brightness keys or the command :
lxqt-config-brightness -d
this has effect on the additional monitor, not the main.

Possible Solution

Either add a option to designate the monitor, or default to main display.

Context

Two monitors:

• first of the laptop
• second through HDMI

System Information

• Distribution & Version: Mageia 7
• Kernel: 5.4.10
• Qt Version: 5.12.6
• liblxqt Version: 0.14.1
• Package version: 1.mga7