I'm using Empathy for IM on Ubuntu 10.04. In every IM client I've used since the '90s there's always been a way to set "idle me after X time", at which point it would set you as being away. Empathy seems to do this, but I haven't found a place to specify how long to wait before marking me as away.
Am I missing a plugin or something in the settings? Is this somehow tied in with Gnome and the power setting's idle time? (I'm using a laptop.)