Screen freeze, when USB-C Dock G4 is connected

[Arpy222]

Hi!

Two external HD monitors are connected to an USB-C Dock G4 docking station, via DisplayPort.

When the USB C cable is connected to the HP 840 G5 laptop, the screen of that freezes.

If there is no monitor connected to the docking station, then the laptop works fine.

I tried to do a firmware update on the docking station, but the screen freezes the same way, when the process is started.

In the log file of firmware update tool, I saw the following:

HP USB-C Dock G4 Firmware Update
====================================
Thu Jun 11 14:42:18 2020
====================================
Graphics adapter initialization:
Auto scan graphics adapter (DDC2bi addr: 0x60)...
NVidia: Library not found!
AMD: Loading DLL... failed!
Intel [Intel(R) UHD Graphics 620]: Init done
Device GUID: 0x1000 [Local FP]... N/A
Device ID: 0x0C: Query Error! (7) by DDC Addr (0x60)
Device ID: 0x0D: Query Error! (7) by DDC Addr (0x60)
Device ID: 0x0E: Query Error! (7) by DDC Addr (0x60)
Device ID: 0x0F: Query Error! (7) by DDC Addr (0x60)
==> No available port!
.....................................
Graphics adapter initialization:
Auto scan graphics adapter (DDC2bi addr: 0x60)...
NVidia: Library not found!
AMD: Loading DLL... failed!
Intel [Intel(R) UHD Graphics 620]: Init done
Device GUID: 0x1000 [Local FP]... N/A
Device ID: 0x0C: Query Error! (7) by DDC Addr (0x60)
Device ID: 0x0D: Query Error! (7) by DDC Addr (0x60)
Device ID: 0x0E: Query Error! (7) by DDC Addr (0x60)
Device ID: 0x0F: Query Error! (7) by DDC Addr (0x60)
==> No available port!
.....................................
Current on-board info:
<Host > Connection failed! (Error (7): ExecuteRegisterRead: Reading data failed!)

<Port#1> Connection failed! (Error (11): SendIspDdcCmd: No ACK!)

<Port#2> Connection failed! (Error (11): SendIspDdcCmd: No ACK!)

Does anyone has some idea, what shall I try next?

Thanks for your help!