Use `conservative' governor instead of `ondemand' by default

Binary package hint: powernowd

from Documentation/cpu-freq/governors.txt:

"The CPUfreq governor "conservative", much like the "ondemand"
governor, sets the CPU depending on the current usage. It differs in
behaviour in that it gracefully increases and decreases the CPU speed
rather than jumping to max speed the moment there is any load on the
CPU. This behaviour more suitable in a battery powered environment."

As you may already know, `ondemand' behaves badly with batteries, potentially shortening theirs life. `conservatives' has been created for use in laptop environment, so why don't we use it? I use it all the time and have never experienced problems watching dvds or listening to music .