Following Evermann's guide the problem has now been fixed

1.Download the dsdt.aml file to my desktop
2.Using a terminal session copy and rename the file to 
/etc/initramfs-tools/DSDT.aml

cd Desktop
sudo cp dsdt.aml /etc/initramfs-tools/DSDT.aml 

3.Navigate to the folder to check the new file

cd /etc/initramfs-tools/ 
ls -l

drwxr-xr-x  2 root root  4096 2008-04-16 16:23 conf.d 
-rw-r--r--  1 root root 17552 2008-04-28 20:29 DSDT.aml 
drwxr-xr-x  2 root root  4096 2008-03-18 17:22 hooks 
-rw-r--r--  1 root root   801 2006-12-21 23:32 initramfs.conf 
-rw-r--r--  1 root root   191 2008-03-19 21:16 modules 
drwxr-xr-x 11 root root  4096 2008-03-19 21:15 scripts 
-rw-r--r--  1 root root   316 2006-12-21 23:32 update-initramfs.conf 

4.Update existing initramfs

sudo update-initramfs-tools -u

5.Add the acpi_no_auto_ssdt option to the kernal load in
/boot/grub/menu.lst

-- 
Laptop fan turns off and then stays off
https://bugs.launchpad.net/bugs/211980
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