Playing with different resolutions and rates using xrandr solved the
problem for me on a DELL XPS 15 with Ubuntu 18.04. If I go with a
resolution of 1920x1080 and a rate of 60 Hz the TV shows a black screen.
Changing to other modes and rates solves the problem. For example,
typing in a terminal
xrandr --output DP-1-3 --mode 1360x768 --rate 60
made it work. If I go for a resolution of 1920x1080, I have output only
for a rate of 25 Hz. I don't know why exactly this happens. Maybe it
depends on the TV?
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which is subscribed to xorg-server in Ubuntu.
https://bugs.launchpad.net/bugs/1771185
Title:
Secondary monitor not connecting in 18.04 LTS
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https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1771185/+subscriptions
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