My screen is dimming and then completely black afters some inactivity period - but in power settings I've got "Dim screen when inactive" switched off. Is there any setting I am missing ?
Ok, thank you for all your help, I'm really impressed by the response.
I did try all mentioned solutions but what helped me was uninstalling gnome-terminal - after that there is no screen dimming at all, which was what I wanted to achieve.
Once more, thank you all for responses, I really appreciate that!
Open dconf editor, there are several places to look. For me the setting I needed to change was found at
org/gnome/session and was called
idle-delay. Hope this helps :)