Hi,
I have the same problem.
I can run the DisplayLink device with an Monitor or I can run the internal video card with the internal monitor of my ThinkPad and with external Monitors.
But I can't get the DisplayLink and the internal device working simultaniously.
Are there any known solutions for Debian? I tried many tutorials and howtos and tinkered with the configs but it just doesn't work.
They are for other distros but seem old enough that Debian should have reached that version of software.
The log files of Xorg show now errors but the second screen of the configuration is blank.
Any suggestions?
Greetings,
ulrich