Public bug reported:

I have an X1 Carbon 6th Gen. (Intel Core i7 8th Gen, 16 GB RAM, 512 GB
SSD).

When I try to attach an external monitor via an HDMI cable the monitor
receives no signal. Similarly, when I use the Thunderbold dock and
attach two monitors (one via HDMI, one with DisplayPort) only the
monitor attached with DisplayPort works; the monitor attached with HDMI
stays black.

This made me think if this is really a bug in the software. I saw people
describing this issue with Windows installed; the solution was to hit a
special key combination. Unfortunately, the multimedia keys all not all
functional, specifically the F7 key, which seems to meant for "activate
external monitor", has no function.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Incomplete

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https://bugs.launchpad.net/bugs/1763202

Title:
  Lenovo X1 Carbon 6th Gen. HDMI not working for external monitor

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  I have an X1 Carbon 6th Gen. (Intel Core i7 8th Gen, 16 GB RAM, 512 GB
  SSD).

  When I try to attach an external monitor via an HDMI cable the monitor
  receives no signal. Similarly, when I use the Thunderbold dock and
  attach two monitors (one via HDMI, one with DisplayPort) only the
  monitor attached with DisplayPort works; the monitor attached with
  HDMI stays black.

  This made me think if this is really a bug in the software. I saw
  people describing this issue with Windows installed; the solution was
  to hit a special key combination. Unfortunately, the multimedia keys
  all not all functional, specifically the F7 key, which seems to meant
  for "activate external monitor", has no function.

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https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1763202/+subscriptions

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