I've heard a lot of reports of horrid battery life in Ubuntu compared to
Windows XP.  Isn't defaulting to "ondemand" when unplugged the issue?
Correct me if I'm wrong, but I thought the default settings in Windows
XP are "ondemand" when on AC and "powersave" when unplugged.  "ondemand"
is extremely sensitive to CPU usage, so basically, as long as the
computer isn't completely idle, the CPU will run at max speed, even when
doing mundane stuff like browsing the web or doing word processing.
That eats up your battery life extremely quickly.

I am running an old Pentium M 1.8 GHz that throttles to 600 MHz on
"powersave".  I have no issues whatsoever playing videos (even H.264
video) and music without skipping in Windows XP.  Thus, I strongly
suggest Ubuntu default to "powersave" mode when a laptop is unplugged.
If that is unacceptable, at least use "conservative".  As it is, laptop
users who don't know how to manually change the governor setting will
likely shy away from Ubuntu due to short battery life.

-- 
Use 'ondemand' cpufreq governor
https://bugs.launchpad.net/bugs/13610
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