I bought this docking station and was able to successfully connect it to my HP notebook and monitor. The problem is that I can only run the monitor at 30 Hz. Is it simply not possible via USB-C or is there any way to increase it to 60 Hz?

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Unfortunately, the specifications are somewhat sparse, but here on p. 11 in the manual you can already see that there are limits regarding resolution:
http://h10032.www1.hp.com/ctg/Manual/c05216640.pdf

The dock has a USB-minimal graphics card built in, so to speak. Comparable with this adapter:
[i-tec USB to HDMI (HDMI, 27 cm)](https://www.digitec.ch/de/s1/product/i-tec-usb-zu-hdmi-hdmi-27-cm-data-video-adapter-10152786)
But just, not all of them can do 4K@60Hz.
Since the dock has a VGA port, I would guess that the USB graphics would match the performance of a VGA port.
What is its resolution ?

Your data. Your choice.

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Question about HP Travel Multi Port Hub

I bought this docking station and was able to successfully connect it to my HP notebook and monitor. The problem is that I can only run the monitor at 30 Hz. Is it simply not possible via USB-C or is there any way to increase it to 60 Hz?