I really don't know why, but after putting XUbuntu 14.04 Ttrusty on my trusty old Dell 6000 laptop, the cpu governor stayed always at 800mhz.. not good. Turns out the fix was easy... just to to a command prompt and..
sudo nano /etc/grub.d/grub
Find the line that says- GRUB_CMDLINE_LINUX and add (inside the quotes) processor.ignore_ppc=1
Hit < Control > o and to save and < Control > x to exit.
reboot and you should be fine