I need a USB-c to HDMI and Ethernet adaptor, what features or protocols do I need to look for, for it to be compatible with Ubuntu 16.04 on a Dell XPS13 (or newer) to drive screens at high resolution?
Some adaptors for sale refer to "DP alt mode" (Display port?). This answer refers to a device not being "displaylink" as the reason it doesn't work.
My question is - what should I be looking for to have a reasonable chance of getting a device that is going to work. What is DP alt mode, what is Display Link in this context?
My Laptop is a 2017 made Dell XPS13 (9350 I think) running Ubuntu 16.04.
I have tried a few adaptors that my colleagues already owned, none are quite what I want - but if I order an untested device - how can I tell if it is likely to work under linux.
The Dell DA200 did not work with HDMI, exactly as described in this question - same question reference above. Although it did work with USB. The Apple Digital AV Multiport Adaptor worked out of the box with HDMI and USB - but doesn't have Ethernet and the USB-C charging port is redundant - as the Dell charges with a barrel jack. This fairly generic HooToo multiport adaptor worked with HDMI and USB - but doesn't have Ethernet.