Running Xubuntu 12.04 on a netbook (Lenovo S10), the
lightdm process which runs in the background takes up constantly a precious 12% of the CPU. Besides, this consumes a considerable amount of energy, and the battery life already isn't that good.
The process I am referring to is shown in
htop as this command:
/usr/bin/X :0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch -background none
Why is this process necessary? Is there a way to reduce its processor usage?