As a workaround, please try passing 'nohz=off' as kernel parameter, i.e., in 
the /boot/grub/menu.lst file:
...
title           Ubuntu 9.04, kernel 2.6.28-13-generic
root            (hd0,1)
kernel          /vmlinuz-2.6.28-13-generic root=/dev/mapper/vg00-UbuntuRoot ro 
nohz=off resume=/dev/mapper/vg00-swap 
initrd          /initrd.img-2.6.28-13-generic
quiet
...

as another option, try installing the 2.6.30 kernel
(2.6.30-020630-generic)) from the mainline-kernel PPA, and see if the
problem persists.

You also might wanna combine both options above (use the 2.6.30 kernel
with 'nohz=off')

-- 
Skype high CPU use on 9.04 using pulse (and audio recording/sending delay >5sec)
https://bugs.launchpad.net/bugs/362203
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