I’m trying out a UD-CA1 dock, hooked up to Dell XPS 9550 (Nvidia graphics) and a Dell 24" 2560x1440 display.
When attaching just the USB-C cable (the OEM one shipped with the Plugable dock) and the HDMI cable to the monitor, the connection seems “flaky”. It can’t maintain a connection for more than a few seconds. The same HDMI cable can be used directly to the machine without any problems. All drivers from Dell (include BIOS updates) are up to date.
Under Windows 10, I get an error occasionally indicating Windows has encountered an error with an attached USB device.
I’ve also tried the dock under Ubuntu 16.10, and that seems to have similar results. I get a full desktop (expanded, not mirrored) for a second or two before the screens (both internal and external) go black. Then they come on for a second again and then go back off. In the kern.log I get this error thousands of times:
usb 3-1.1.1: 2:1: usb_set_interface failed (-19)
Power deliver to the computer does seem to work, but beyond that I can’t get much to function. Even with no items plugged into the dock, the computer seems to slow down substantially, with a cursor delay and slow window refreshes.
I’ve previously used both the Dell TB15 and subsequent TB16. Both of those docks were also highly problematic, though it was mostly the audio and network that dropped out occasionally. The HDMI connection had always been solid.