I have turned off
dim screen when inactive, but it doesn't work. I even checked via
gsettings get org.gnome.settings-daemon.plugins.power idle-dim if it's really turned off, and the command says, that it is. How can I turn off dim screen when inactive?
Edit: I have found out, that it's caused by my wireless mouse – it has low battery. Can someone help me how to turn off this kind of save power mode?