Second monitor won't connect

[nonthevisor]

I have also detailed the problem on stackoverflow.
After writing that post, I decided to do a full uninstall and full install again. After that, I tried the solution here (again), which did not work (again).

Right now, this is my debug output:

--------------- Linux system info ----------------

Distro: Debian
Release: stretch
Kernel: 4.9.0-8-amd64

---------------- DisplayLink info ----------------

Driver version: 5.1.26
DisplayLink service status: up and running
EVDI service version: 1.6.0

------------------ Graphics card -----------------

Vendor: i915
Subsystem: Ltd
VGA: Intel Corporation 4th Generation Core Processor Family Integrated Graphics Controller (rev 06)
VGA (3D): 
X11 version: 1.19.2-1+deb9u5
X11 configs: /etc/X11/xorg.conf.d/20-displaylink.conf

-------------- DisplayLink xorg.conf -------------

File: /etc/X11/xorg.conf.d/20-displaylink.conf
Contents:
 Section "Device"
    Identifier  "DisplayLink"
    Driver      "modesetting"
    Option      "PageFlip" "false"
EndSection

-------------------- Monitors --------------------

Providers: number : 2
Provider 0: id: 0x78 cap: 0xf, Source Output, Sink Output, Source Offload, Sink Offload crtcs: 3 outputs: 2 associated providers: 0 name:modesetting
Provider 1: id: 0x41 cap: 0x2, Sink Output crtcs: 1 outputs: 1 associated providers: 0 name:modesetting

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[Barabazs]

Closing this issue for lack of activity.