Surface Laptop 3 and HP 27f monitor. Fantastic connecting over USB-c and 1.5m cable from iTec.
All refresh rates work, all admissible screen resolutions, too.
Dock2 installed properly. Audio, Ethernet, USB, LAN - all functioning.
Monitors? Issues as everyone described - unbelievable.
I installed Displaylink. Used with another HP docking station. Excellent results. Unistalled it again.
Uninstalled even Kaspersky KTS . No difference.
The only walk around was 75Hz for external monitor configured in the USB-c of Surface Laptop and extended view.
Afterwards I switched the cable into the Dock 2.
Firmware 5.19.139 . Tests give all a pass.
I also opted out from DFCI management in UEFI. see this Intune management of Surface UEFI settings - Surface | Microsoft Docs
Something looks like hardware issue imho. I will wait one more week and return the doc2 as unsatisfied customer of MS.
Other ideas are welcome.
Update:
I have bought the adaptor from Microsoft. Monitor connects with a very good quality HDMI-cable to it and subsequently to the docking station.
To my surprise: it works!
I could use it to 50Hz, 60Hz, full HD. No experience with 4K.
The HDMI-USBc Cable was from iTEC, and works fine when connected to the USB port of the laptop.
**IMHO,**the maximal cable length of 1m for USB 3.1 is extended too much using the docking station plus another medium quality cable and this is why the monitor is not recognized when connected remotely from computer.
When we plug the monitor straight in the Surface's USB port, the length is OK and monitor works.
The bottleneck may be the jumping point from USB cable structure (few cores) to HDMI port and cable structure (many cores, different impedances, etc).
I wanted to share with you. ****
Anyway, it works now.