Ubuntu – Ubuntu 18.04 go dim despite it’s turn off


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?

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