On my HP laptop with Fedora 23, screen dims after 20 seconds when using batteries, and I couldn't find a way to change that. I've set
gsettings set org.gnome.settings-daemon.plugins.power idle-dim false
but it doesn't seem to have any effect.
This is annoying and forces me to keep the laptop connected to the power plug at all times.
Is there a way to increase the delay or to turn it off?