I got ubuntu 14.04 on hp pavalion g6 with an amd apu a6 llano which has a stock frequency of 1500mhz and is capable of boosting to 2400mhz.
But on my system it's turbo boost feature is not working.
I had a similar issue on my dell inpiron, and solved it though several steps. There are a few needed applications, and an edit to /etc/rc.local
Install indicator-cpufreq, cpufrequtils: Open a terminal window ctrl+alt+t and enter
sudo apt-get install indicator-cpufreq sudo apt-get install cpufreq-utils
These will help monitor your cpu
The edit to rc.local tells Ubuntu to ignore some settings in your bios, and will need to be customized for the number of CPU's that you have.
sudo nano /etc/rc.local
Before the line which says "exit 0", enter the lines
echo 1 > /sys/module/processor/parameters/ignore_ppc for x in /sys/devices/system/cpu/cpu[0-3]/cpufreq/;do echo 2501000 > $x/scaling_max_freq done
replace "2501000" with the maximum frequency of your CPU, in kHz (it should be 2401000) - the extra '1' in the frequency indicates turbo mode
You can determine the max frequency your system supports by
Reboot, and everything should be good.