Ubuntu Desktop 20.04: Prevent the display from turning off

When I start my notebook and my TV screen stays off and is switched on afterwards, I have to type on the keyboard to see the login area. Does anyone know why?

In addition, my Ubuntu Desktop 20.04 seems to continue to switch off the display after a certain time, even though it is connected to the socket.

Under "Energy" > "Turn off screen", the setting is set to "Never".

Solution 1:

Under System Settings -> Power there should be two settings called "Dim Screen When Inactive" which is a toggle switch and "Blank Screen" which selects a time before the screen is turned off.

If you do not wish to have the screen turned off after a period of inactivity, you should disable this setting.