Ubuntu Wiki

-- Video and CPU Scaling Fixes -- Open a Command Line Terminal, type the following:

sudo gedit /boot/grub/menu.lst

This will bring up the grub boot menu configuration file.
Scroll to the bottom of the file and you'll find several boot options.
Go to the first, This is a sample of what to look for:

title           Ubuntu 9.04, kernel 2.6.28-16-generic
root            (hd0,0)
kernel          /boot/vmlinuz-2.6.28-16-generic root=UUID=1dd1d295-9c26-4b2b-a242-6f9cafad3157 ro quiet splash
initrd          /boot/initrd.img-2.6.28-16-generic

Then we "Insert" our acpi_osi="!Windows 2006" option.
The end result should look something like this:

title           Ubuntu 9.04, kernel 2.6.28-16-generic
root            (hd0,0)
kernel          /boot/vmlinuz-2.6.28-16-generic root=UUID=1dd1d295-9c26-4b2b-a242-6f9cafad3157 ro acpi_osi="!Windows 2006" quiet splash
initrd          /boot/initrd.img-2.6.28-16-generic

REMEMBER - These are just examples. You need to modify whats on your OWN system. Do NOT just cut and paste what you see here into your own /boot/grub/menu.1st file.

This will enable CPU speed scaling, helping preserve the Mini-Note's already limited battery life. For more information about this bug (which is in the kernel, and not specific to the Mini-Note) see this link.