DisplayLink поставлен?
support.displaylink.com
To use the monitor's touchscreen capabilities, you must have the Displaylink software installed.
In order to make the touchscreen capabilities to work, make sure:
The USB cable connects the computer to the monitor.
Your computer should support USB 2.0 or 3.0 technology.
Turn off the monitor and disconnect the AC adapter from the base, then reconnect the AC adapter and turn the monitor back on. If this does not help, try restarting the computer, as well.
The Displaylink software has been installed on the computer.
ПС. Только заметил возраст вопроса... Ну может кому пригодится.