Questions prompted by move to Debian 12

[Richard Owlett <rowlett@access.net>]

I've used Debian since days of Squeeze. My desktop was Gnome2 until MATE 
was released (found Gnome3 uncomfortable).

I've been using Debian 9 with MATE and /home on its own partition.

I've installed all of Debian 12 (w MATE) to a single partition.

Is the content of Mate's Power Management help available on a web page?