Can not change sleep timeout when on AC

Support & Help Requests
1

I used dconf editor to change my sleep timeout to 300 seconds when on AC.

But there is no change?

Is the sleep timeout not configurable?

2

What are outputs of the following commands?

gsettings get org.gnome.settings-daemon.plugins.power sleep-inactive-ac-timeout
gsettings get org.gnome.settings-daemon.plugins.power sleep-inactive-ac-type
3 
Here they are.

 300
 suspend

Where is the file that contains those settings?

4

  1. Open dconf

  2. Navigate to org.gnome.settings-daemon.plugins.power

    image.png915×724 56.2 KB

  3. Set the required value Custom value (based on the Description if use 0 => never)

    image.png916×687 55.3 KB

This works on my PC.

And this is set up via Control Center -> Power Management

image.png979×477 61 KB

5

I have already done that.

It does not work on my system.

Control Power Management only has 10,30 mins, 1 and 2 hrs and never.