How can I get the value of which monitor the cursor is on?

[aljustiet]

I want to get it because I want to change the brightness of the screen based on this. If the cursor is on the first monitor, the up/down brightness binding will change the first monitor, and if it is on the external monitor, it will change the external monitor's brightness.

[aljustiet]

I can use the hyprctl activeworkspace | grep monitorID. But I don't think it's optimal for the CPU.

[aljustiet]

Does someone why I have this issue too:

~ ddcutil -b 13 setvcp 10 - 10
~ monitorID=$(hyprctl activeworkspace | grep -oP '(?<=monitorID: )\d+')

if [ "$monitorID" -eq 0 ]; then
  sudo ddcutil -b 13 setvcp 10 - 10
elif [ "$monitorID" -eq 1 ]; then
  sudo ddcutil -b 11 setvcp 10 - 10
fi
DDC communication failed for monitor on bus /dev/i2c-11