HDMI not detected anymore

I had a normally working Lenovo S27i-10 monitor on the HMDI port of my Ubuntu Mate 20.04 system. It is suddenly not detected anymore:

henk@henk-N24-25BU ~> xrandr | grep 'connected'
eDP-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 344mm x 194mm
DP-1 disconnected (normal left inverted right x axis y axis)
HDMI-1 disconnected (normal left inverted right x axis y axis)
HDMI-2 disconnected (normal left inverted right x axis y axis) 

Monitor works normally on VGA. The monitor shows as disconnected on a different laptop running Xubuntu as well. Monitor works perfectly well on Windows laptop using the same HDMI cable.

How can I connect this monitor on the HMDI port again on Ubuntu? (in other words, how can I diagnose where the problem is and solve it).

7

2 Answers

Solved by:

sudo dpkg-reconfigure gdm3

This produced:

gdm.service is not active, cannot reload.
invoke-rc.d: initscript gdm3, action "reload" failed.

after which everything worked again.

I've got Lenovo P50s laptop with Kubuntu 20.04 and it too stopped detecting my HDMI monitor recently.

The solution as suggested by @BeastOfCaerbannog didn't work for me.

After today's slew of package updates though, it started working again, so perhaps it looks like a software defect, that was subsequently fixed again.

1

Your Answer

Sign up or log in

Sign up using Google Sign up using Facebook Sign up using Email and Password Submit

Post as a guest

Post Your Answer Discard

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy