Sometimes when I try to suspend my laptop (using the sleep keyboard button), I get this popup from xfce4-power-manager:
"Are you sure you want to hibernate the system? An application is currently disabling the automatic sleep. Doing this action now may damage the working state of this application." I don't want to hibernate - I would like to know which application is disabling sleep, so that I can quit it and suspend the system normally. How can I find this out?
I'm on Xubuntu 15.10.