How to (try to) suspend and how to tell if it was suspended?

[Greendrake]

There are quite a few threads around about the ability to use the battery-saving "suspend" feature — whether it works, what distros, what bootloaders, whether eMMC or SD etc.

I am currently playing with different distros/configurations and would like to know/undestand how to actually try to suspend before I can even see if it works. A number of questions here:

• Where is the "Suspend" button in various GUIs (Phosh, Plasma etc.)?
  
• Is it the same as screen lock?
  
• When the phone has its screen dark/seemingly off, how to tell if it is actually suspended?
  
• Is "suspend" the same feature as "sleep" and "standby", or are there nuances/differences?
  
• How to try to suspend from command line? `systemctl suspend`?
  
• Given that suspend is fully supported/enabled, when is the phone supposed to suspend automatically?
  
• What about hibernation?
  

Thanks in advance  .