I even could reset the value of event when "critical battery" to suspend (I also changed policy of upower suspend back to yes).
So it seems that unpluggin the power cable puts the system to suspend/hibernate/blank screen only because it thinks that the laptop screen is being closed.
I also get the warning message of "2 minutes left" when unpluggin the power cable but there is no action because of this.
Maybe there is a better way to let the system check that the laptop screen is open/closed.
Another addendum to previous posts:
I even could reset the value of event when "critical battery" to suspend (I also changed policy of upower suspend back to yes).
So it seems that unpluggin the power cable puts the system to suspend/ hibernate/ blank screen only because it thinks that the laptop screen is being closed.
I also get the warning message of "2 minutes left" when unpluggin the power cable but there is no action because of this.
Maybe there is a better way to let the system check that the laptop screen is open/closed.