Hi, everyone.

My laptop is also M4600 which CPU is 2820qm and running Ubuntu 11.04. I have 
also suffered from this problem for months: The maximum frequency of the CPU is 
2.3Ghz while Ubuntu recognized it as only 1.6Ghz.
It seems that the cause of this problem is Ubuntu got wrong CPU information 
from BIOS.

I finally found a solution from a website - it works well on my laptop.

Edit this file:
sudo gedit /etc/default/grub 

find the line of: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

adding   processor.ignore_ppc=1   within the quotation mark. Let OS to
ignore the wrong CPU information

save and run "sudo update-grub" in terminal, enabling the code added
previously.

Restart and the problem will be solved!

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https://bugs.launchpad.net/bugs/819605

Title:
  Dell M4600 has problems with CPU Freq Scaling on Ubuntu 11.04 64bit.

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