I had the same issue. Completely shutting down the machine (not just
rebooting) fixed it.
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https://bugs.launchpad.net/bugs/1659834
Title:
HDMI port not working
To manage notifications
Suddenly started working again three days later. No idea why. Feel free
to close this
** Changed in: xorg (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1659834
