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<h1>Power (Saving) States</h1>
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Before setting power preferences, you must look through the different power saving states offered by Ubuntu.
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The Common power (saving) states are <b>awake</b>, <b>standby/sleep</b>, <b>suspend</b> and <b>hibernate</b>.
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<li>During the awake state all components of the computer are running.</li>
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<li>During standby/sleep the CPU keeps running your programs but some components like the monitor and harddisks may be turned off. When you touch the mouse or keyboard or a harddisk is accessed by software they quickly wake up again.</li>
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In both the awake and the standby state the speed of modern CPUs may be throttled down,though. For example if not in use.
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<li>During suspend however the CPU is always stopped. In modern PCs even all other components except the RAM memory can be turned off. The RAM will hold the state.</li>
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<li>During hibernation the state is written to harddisk and the whole computer is turned off.</li>