Hello,
i have the same problem with my LS100.
I have 2x Asus PB278 and 1x Dell AW2721D as main monitor.
When iCue starts, the backlight on the main monitor goes off.
If i select one of the Asus monitors, the light goes back on.
I have testet the solution in this thread and unplug the asus.
Then the backlight on the Dell works perfectly and i can plug the Asus monitors back in.
But after a pc restart everything starts all over again 😞
What can i do?