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While running an Ubuntu kernel (not a mainline or third-party kernel)
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apport-collect 1763202

and then change the status of the bug to 'Confirmed'.

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This change has been made by an automated script, maintained by the
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** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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

Status in linux package in Ubuntu:

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

  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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