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Paper Tape
Posts: 2
Registered: ‎10-12-2018
Location: US
Views: 946
Message 1 of 2

X1Carbon (Gen6, 2018) and USB-C Hybrid dock, no monitors detected



Hi there,

during setup of my laptop, I stumbled upon a problem, which it seems, I can't solve on my own. Thus, I decided to register and write here, hoping that someone can maybe help me or give me any advice what else to try.


So currently I've running an up to date (pacman -Syu) arch system on my Lenovo ThinkPad X1 Carbon (Gen 6):

# dmidecode -t system | grep Version
   Version: ThinkPad X1 Carbon 6th


Furthermore, I bought a ThinkPad Hybrid USB-C with USB-A dock (product number 40AF0135EU) and I'd like to use the dock together with my laptop. When I plug the USB-C cable into my laptop, all of the following ports work out of the box:

  • 5x USB-A ports

  • 1x USB-C port

  • 1x Headphone jack

  • 1x Ethernet port

The only ports, which are not working, are the two HDMI- and the two Display-ports. When I plug in any working (I checked them with a second setup I am currently running) cable, either HDMI or DP, literally nothing happens. The dock itself isn't broken as well as it works with  my Windows ThinkPad.


So, I checked the following logs and outputs, all while having an external monitor connected via HDMI or after freshly plugging in the dock:


'xrandr' - (HDMI cable is connected to the dock and to a switched on monitor)

'dmesg' - (cleared dmesg before and then connected the dock, line 23)

'lsusb' - (with dock connected)

'Xorg.0.log' - (with dock connected)


Within the 'Xorg.0.log' file the lines 77-100 made me wonder, whether I have the correct drivers for my GPU installed. Currently, I've got installed 'xf86-video-intel'. However, this wiki page confused me and now im unsure whether this is wrong?


Regarding my setup:

At the moment I'm logging in on the CLI and starting i3 afterwards with 'startx' and 'xinitrc'. I did not yet setup i3 to use multiple monitors, but I think that xrandr should stil list external monitors, shouldn't it?


Also, when the dock is connected before booting the machine, the monitors are not recognized after booting and logging in.

I hope that any of you guys maybe has an idea what I could be missing. If you require any more logs or information, I'm happy to provide them to you!


Thanks and cheers

Paper Tape
Posts: 2
Registered: ‎10-12-2018
Location: US
Views: 883
Message 2 of 2

Re: X1Carbon (Gen6, 2018) and USB-C Hybrid dock, no monitors detected

Topic can be closed. Issue is related to DisplayLink. For solution see here:

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