I have a Thinkpad X1 Carbon Gen 7 with Ubuntu 18.04. This devise has one HDMI port and two USB-C port. I want to connect two external monitors on one USB-C port.
When I ran xrandr, I get the following:
eDP-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 309mm x 174mm
1920x1080 60.05*+ 60.01 59.97 59.96 59.93
...
DP-1 disconnected (normal left inverted right x axis y axis)
HDMI-1 disconnected (normal left inverted right x axis y axis)
DP-2 disconnected (normal left inverted right x axis y axis)
Then I got one of these USB-C adapters with 2-HDMI ports, connected it to the laptop using the USB-C port and connected the two external monitors on the HDMI output of the hub.
The problem is that the two monitors show exactly the same thing, and when I go the Display setting, I only see one monitor. It seems that the two HDMI ports on the hub, are detected as one device.
This same thing happens when I use the other USB-C port. So my question is that if there is a way to have two external monitors using this hub or similar hubs from one USB-C port.
The Link's fine print says only Windows supports the Multi-Stream Transport (MST) required to daisy chain two monitors. As such I suspect that is why monitors are mirrored.
Check with vendor perhaps there is a work around or it's not too late to return it and get your eighty bucks back.
Looks like a dock may (repeat, may) solve your problem: Lenovo advertises multiple docks, but this one explicitly says it supports two external monitors. I would confirm that with Lenovo Support before buying, though.