ASUS ZenBook UX434 with ASUS Docking USB3.0 HZ-3A external Monitor not working

[thool2b3]

Hi,
I am a newbie on Linux and any help is appreciated.
When Diplaylink-debian driver failed to work as expected on my ASUS ZenBook UX305CA (see #949) I tried to install it on my newer ASUS ZenBook UX434 (Distro: LMDE 6 Faye, further details see attached system information).
On my first attempt I installed Diplaylink-debian with NVIDIA nouveau driver but this failed. LMDE hung after rebooting.
On my second attempt I installed with NVIDIA proprietary driver (NVIDIA Corporation GP108BM [GeForce MX250], further details see nvidia-detect.txt).
When this attempt also failed and LMDE again hung after reboot this time I started a Live-Session and renamed the 20-displaylink.conf.
Now the system rebooted normally but still the external monitor is not working.
I followed the Post Installation Guide but I could not get the external monitor working.
Attached I send the debug information (see UX434_DisplayLink_Debian_DebugInfo.txt.
Note: Provider 5: id: 0x23f cap: 0x0 crtcs: 0 outputs: 0 associated providers: 0 name:NVIDIA-G0
When I run xrandr --setprovideroutputsource 5 0 I get the folowing error:

X Error of failed request:  BadValue (integer parameter out of range for operation)
  Major opcode of failed request:  140 (RANDR)
  Minor opcode of failed request:  35 (RRSetProviderOutputSource)
  Value in failed request:  0x23f
  Serial number of failed request:  20
  Current serial number in output stream:  21

What can I do to get the external monitor working with my ASUS docking station.
Thank you for your help.

nvidia-detect.txt
systreminformation.txt
UX434_DisplayLink_Debian_DebugInfo.txt

[thool2b3]

some additional information:
USB devices with ASUS docking station attached:

USB:
  Hub-1: 1-0:1 info: Hi-speed hub with single TT ports: 12 rev: 2.0
    speed: 480 Mb/s chip-ID: 1d6b:0002 class-ID: 0900
  Hub-2: 1-1:2 info: Genesys Logic Hub ports: 4 rev: 2.1 speed: 480 Mb/s
    power: 100mA chip-ID: 05e3:0610 class-ID: 0900
  Hub-3: 1-1.2:4 info: Genesys Logic Hub ports: 4 rev: 2.1 speed: 480 Mb/s
    power: 100mA chip-ID: 05e3:0610 class-ID: 0900
  Device-1: 1-1.2.3:6 info: Microsoft 2.4GHz Transceiver v8.0 used by mouse
    Wireless Desktop 900 type: Keyboard,Mouse,HID driver: hid-generic,usbhid
    interfaces: 3 rev: 2.0 speed: 12 Mb/s power: 100mA chip-ID: 045e:07b2
    class-ID: 0300
  Device-2: 1-4:3 info: Realtek RTS5129 Card Reader Controller
    type: <vendor specific> driver: rtsx_usb,rtsx_usb_ms,rtsx_usb_sdmmc
    interfaces: 1 rev: 2.0 speed: 480 Mb/s power: 500mA chip-ID: 0bda:0129
    class-ID: ff00 serial: <filter>
  Device-3: 1-5:5 info: IMC Networks USB2.0 HD IR UVC WebCam type: Video
    driver: uvcvideo interfaces: 4 rev: 2.0 speed: 480 Mb/s power: 500mA
    chip-ID: 13d3:56cb class-ID: 0e02 serial: <filter>
  Device-4: 1-10:7 info: Intel AX201 Bluetooth type: Bluetooth driver: btusb
    interfaces: 2 rev: 2.0 speed: 12 Mb/s power: 100mA chip-ID: 8087:0026
    class-ID: e001
  Hub-4: 2-0:1 info: Super-speed hub ports: 6 rev: 3.1 speed: 10 Gb/s
    chip-ID: 1d6b:0003 class-ID: 0900
  Hub-5: 2-1:2 info: Genesys Logic USB3.0 Hub ports: 4 rev: 3.0
    speed: 5 Gb/s chip-ID: 05e3:0617 class-ID: 0900
  Device-1: 2-1.1:3 info: Magic Control USB3.0 External Graphics Device
    type: <vendor specific> driver: N/A interfaces: 1 rev: 3.0 speed: 5 Gb/s
    power: 8mA chip-ID: 0711:5809 class-ID: 0000
  Hub-6: 2-1.2:4 info: Genesys Logic USB3.0 Hub ports: 4 rev: 3.0
    speed: 5 Gb/s chip-ID: 05e3:0617 class-ID: 0900
  Device-1: 2-1.2.1:5 info: Magic Control USB3.0 External Graphics Device
    type: Audio driver: snd-usb-audio interfaces: 4 rev: 3.0 speed: 5 Gb/s
    chip-ID: 0711:5812 class-ID: 0102
  Device-2: 2-1.2.2:6 info: ASIX AX88179 Gigabit Ethernet type: Network
    driver: ax88179_178a interfaces: 1 rev: 3.0 speed: 5 Gb/s power: 8mA
    chip-ID: 0b95:1790 class-ID: ff00 serial: <filter>

and without docking station

USB:
  Hub-1: 1-0:1 info: Hi-speed hub with single TT ports: 12 rev: 2.0
    speed: 480 Mb/s chip-ID: 1d6b:0002 class-ID: 0900
  Device-1: 1-4:3 info: Realtek RTS5129 Card Reader Controller
    type: <vendor specific> driver: rtsx_usb,rtsx_usb_ms,rtsx_usb_sdmmc
    interfaces: 1 rev: 2.0 speed: 480 Mb/s power: 500mA chip-ID: 0bda:0129
    class-ID: ff00 serial: <filter>
  Device-2: 1-5:5 info: IMC Networks USB2.0 HD IR UVC WebCam type: Video
    driver: uvcvideo interfaces: 4 rev: 2.0 speed: 480 Mb/s power: 500mA
    chip-ID: 13d3:56cb class-ID: 0e02 serial: <filter>
  Device-3: 1-10:7 info: Intel AX201 Bluetooth type: Bluetooth driver: btusb
    interfaces: 2 rev: 2.0 speed: 12 Mb/s power: 100mA chip-ID: 8087:0026
    class-ID: e001
  Hub-2: 2-0:1 info: Super-speed hub ports: 6 rev: 3.1 speed: 10 Gb/s
    chip-ID: 1d6b:0003 class-ID: 0900

For me it looks like the additional hardware is being detected.
Everything is working fine but only the external monitor connected via DVI cable remains dark.
Any suggestions to get it working appreciated.

Btw. my Toshiba-TV (1920x1080) attached via HDMI cable is working just fine so in general Displaylink-debian seems to work.

[thool2b3]

Anybody out there? Perhaps vacation time?