Question about my mouse

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https://bbs.archlinux.org – I am new to arch linux,(more accurately linux)and I find the distribution much more wonderful than I thought. However, I have encountered the question below:I am using a laptop. If I am working on battery power and leave the mouse there for about 5 seconds, then the mouse seems to be "shut down" and I have to click the left button to move the cursor. This phenomenon doesn't appear when I am using AC power. I think this has something to do with my power settings but I can't figure out how to change it.PS.1. I am using gnome2. I doesn't remember if this happened before. (HowTos)