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If I put the CPU mode into powersave or ondemand, it works for some time (5-10 minutes) but after that time Lubuntu automatically sets the CPU to performance mode.

(I see it doing sudo cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor )

Any ideas to prevent that?

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Does Jupiter help? – jasmines Jul 20 '12 at 7:44

From the top right hand gear-like icon, go to System Settings, where you will find an icon called Power. There you can select "Suspend when inactive for 'n' minutes. You can change this setting and see what happens.

If it is a laptop that you are using, it is better to read manufacturers instructions to see if there is a battery-saving feature installed by default.

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The OP is using Lubuntu not Unity. – Uri Herrera Aug 2 '12 at 10:08

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