I got Ubuntu server 18.04.1 running on a laptop with a broken display. Obviously, I Used an external monitor for the install

Now when I disconnected the external monitor, the server suspends within seconds.

I tried to prevent that by masking sleep.target, hypernate.taget, suspend.target, and hybrid-sleep.target.

This worked. It does not suspend :-) But... :-( Now it is filling the logs with about messages 100 messages per second that it can not suspend causing one of the cores running 100%. Again only when the monitor is disconnected.

The laptop lid is still open but eventually, I like it to be closed while the server is still running.

Someone suggested the defective display could be sending some malfunctioned messages to the System, So I disconnected its connector from the mainboard.

What am I missing?
What do I search for?

does this server have a GUI?

are you logged in as a user at all times?

instead of masking services, have you tried editing /etc/systemd/logind.conf (and reboot)?

Thanks for taking your time for responding.

No it does not run a GUI. I do not mask the services anymore since it was not the resolution. No users are loggen locally.

For now iIt's running as pihole dns and webserver, if this all works I like to use it as a NextCloud instance.

What do you suggest to change in logind.conf?

it has a man page:
you could also show us the output of

Thanks again ondoho for your respond.

Systems-inhibit showed: 0 inhibitors listed
Logind.conf has some Nice options. I was not aware of that.

I will give it a go and let you know the results.

Thanks again. It works .
Nice touch to not give the answer but instead 'forcing' me to read the man page.

It's working without the external monitor. Lid closed.

One thing though. Now I can not seem to restart it.
When the reboot command is given it halts with the cursor flashing in the left top corner.
I need to physically shut it down and restart it again.

Do you have a tip here as wel?

i hope this isn't ironical.

hm.
and this worked before making the changes?
i think you should now show us exactly what you did there.
and look at systemd-inhibit again. and at journalctl.

Hi Ondoho,

Haha no, no irony intended at all. absolutely not. I personality like to refer to RTFM, but I was not able to find the manual this time. Had no clue were to start. ;-)

the server worked fine before trouble shooting this issue.
This means before masking the xxxx.target mentioned in my first post.
Since that did not work I unmasked them again.

I'll see if I can find anything in the logs.