When in console (i.e. not in Gnome or KDE) the display will automatically power down in case of inactivity. It seems to me to be set to something around 30 minutes. This power management is completely independent of the X server, and indeed works when no X server is installed. It seems to work entirely independent of userspace.
Is it perhaps done by kernel?
Can somebody please explain where this power management comes from and how it can be configured (i.e. changing the timeout, etc).
I am using Debian Wheezy