If you have a desktop, power consumption shouldn't be a real issue if you're not a environmental activist. For Laptop users, power consumption is always an issue and in Ubuntu, there are several ways to reduce this.
The easiest way is to change the power options from the menu, go to the Ubuntu menu, then to Preferences and Power Options. Here you can do some common changes which you also find in Windows for example.
But there is a difference between laptops and desktops, therefore you can change a parameter in a configuration file where you can tell Ubuntu that you're working on a laptop. You have to do the following:
Open a terminal and type: sudo gedit /etc/default/acpi-support
Now you will see an editor, look for ENABLE_LAPTOP_MODE=false and change this to ENABLE_LAPTOP_MODE=true
Reboot your laptop to make sure that the configuration has been loaded properly.
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