Neither using the Settings application nor the command:
gsettings set org.gnome.desktop.session idle-delay 120
Does have any affect on turning the monitor idle.
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GUI : To change the keys you can use “dconf Editor “.
it worked fine for me.
edit : try flipping values of org/gnome/desktop/session idle-delay to 300 ( the values are in seconds, so 300 = 5 min
utes )
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What keys are you changing? Could you flesh out this answer a little bit to describe how it would solve the problem at hand? – Jeff Schaller♦ Nov 18 '18 at 13:43
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values of org/gnome/desktop/session idle-delay, it does exactly what the command says. – Kushagra Karira Nov 19 '18 at 11:46
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This is exactly what the OP reports as not working (we're talking about the same
dconfkey). Saying "it's working for me" doesn't help much... – don_crissti Nov 19 '18 at 12:00
xset -q? – Sebastian Nov 19 '18 at 16:47