Or at least it was not enough for me on 3 different computers with this configuration:
CPU: Dual Core Intel Core i5-7200U
Kernel: 5.15.6 x86_64
Desktop: KDE Plasma 5.23.4
One monitor attached to HDMI and the other on the USB 3 DisplayLink Adapter.
Installation was made like this:
In terminal run:
Providers: number : 2
Provider 0: id: 0x47 cap: 0xb, Source Output, Sink Output, Sink Offload crtcs: 4 outputs: 4 associated providers: 1 name:Intel
Provider 1: id: 0x251 cap: 0x2, Sink Output crtcs: 1 outputs: 1 associated providers: 1 name:modesetting
The monitor on the adapter is in the Display and Monitor settings.
I hit Enable and apply there, however no output on the monitor attached to the DisplayLink Adapter.
After a lot of testing/reading I did this:
Run in terminal:
to get the devices
HDMI1 and the adapter is DVI-I-1-1
xrandr --output HDMI1 --auto --primary --output DVI-I-1-1 --auto --right-of HDMI1
Lo and behold the monitor on the adapter turned on.
The mouse however, was going crazy, leaving ghosts pointers all over the screens.
I was able to remove that with:
Compositor >remove mark in “Enable compositor on startup”
I couldn’t find this workaround anywhere, maybe someone can save some time with this.