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?

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