[Libdlo] Software switch off displaylink usb monitor

[Markus]

Hi,

i am owner of a Displaylink USB Monitor Samsung U70.
I want to turn off the display per software.

On my dvi monitor this works with
	DISPLAY=:0 xset dpms force off
After a few seconds the dvi monitor goes to standby automatically


At the displaylink monitor i can do the same:
	DISPLAY=:1 xset dpms force off
The displaylink monitor goes black but doesn't switch off. How to do
this? Should the drivers be unloaded (but how reload?)? How switch on
then again?

Thanks for your help.

Best regards
Markus