It has been found, that the removal of a simple PMU (Power Management
Unit) System file, that Apple portables seem to run a little cooler.
So, how do you remove, and what file is it?
The file can be found by selecting Go in your menu bar, selecting Go to
Folder, and typing in var/db/SystemPreference. That will bring you to
the folder, but you will not be able to remove the file
com.apple.PowerManagement.xml, simply because you do not have
permission to do so.
Open up a session in Terminal. From Terminal, you will be able to
remove the file by typing the following:
sudo rm
/private/var/db/SystemConfiguration/com.apple.PowerManagement.xml
Hit enter. This will prompt your machine to ask for your ROOT password.
Entering the password will then enable Super User do, sudo, to remove
the folder.
Shut the machine down. While the machine is turned off, perform a PMU
reset, Control, Option, Shift and Power. Wait five or more seconds,
restart the machine. The PMU reset may force you to reset the time and
date on your machine.
Secondarily, with a second mac and Tinker Tool, or other
invisible/hidden folder apps, you could mount the drive of your
portable via FireWire Target Disk mode, and remove the file without
running into permission issues.
Or finally, Boot to single user mode and rename the file. To boot into
single user mode, hold down the Apple key and 's' at Boot. From there,
type the following commands:
/sbin/mount -uw /
cd /private/var/db/SystemConfiguration/
mv com.apple.PowerManagement.xml com.apple.PowerManagement.xml.backup
shutdown -h now
Before rebooting, the PMU reset is applied by holding down Control,
Option, Shift and Power. Wait five or more seconds, restart the
machine, and use. In this last part, we have not removed the file, but
nearly renamed it.
