Comment 9 for bug 36568

> When I'm connected to the AC I want the display to be put to sleep
> after 30 minutes, ...
> Instead when I'm on battery I need to switch off the display as soon
> as possible, to save power.

As I understand things, this isn't a problem. You could set the gnome-screensaver preference to 1 minute, the gnome-power-manager battery blanking preference to 1 minute (so it will happen after 2 minutes - 1 + 1) and the gnome-power-manager AC blanking preference to 29 minutes (so it blanks after 29 + 1 = 30 minutes).

I agree that it isn't good, but if you read the 'watched' bug:
http://bugzilla.gnome.org//show_bug.cgi?id=336061
you see that there isn't much that they can do about it at this stage. I too would like it to be independent, but I got a no-can-do on that from upstream.

The locking issue is a different issue and you should file it as a different bug, but I am guessing that being forced to use gnome-screensaver is going to stop it being a problem.