Enable sleep when idle

[hexman]

I apologize in advance if i failed to search more thoroughly, i remember seeing this information somewhere but cant for the life of me find it anywhere.

I recall that with some recent builds the sleep on idle option has been removed when boot storage is a USB stick due to some possible issues with freezing on some devices. I never had these problems but recently re installed and lost this functionality.

There was a config string that could be entered to get around this and make the sleep on idle functionality re-appear, does anyone know what that was?

Thanks