Another discovery for this issue....
If I log into my laptop on battery, using external USB keyboard, then close the 
lid I can see the laptop is still alive by the LEDs on the keyboard. (The 
external monitor is powered off at this time)
If I then turn on the mains powering the external screen and the laptop via its 
power adapter, the laptop then goes to sleep. Lifting the laptop lid then wakes 
the laptop up and the external monitor then shows the desktop.
Is this some kind of power state machine problem with the handling of external 
events?

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https://bugs.launchpad.net/bugs/2098370

Title:
  22.04 & 24.04.1 Suspend\Hibernate after desktop login using ext
  keyboard\monitor

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