Hello,
Is it that dock?
http://www.sunrichtech.com.hk/products/U-2470.html
If so, it is using a DL-3900 which can go up to 2048x1152p60 on HDMI.
It would be best to confirm with the support line with the log details before spending money.
Here is how:
https://support.displaylink.com/know...to-displaylink
Regards,
Alban