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CPU tuner tries to save as much battery power as possible.
CPU tuner gives you control over the power consumption of your android device. Its prime purpose is to be a battery saver and to save as much battery as possible, but it can be used to overclock at the same time (if the kernel of your device supports it).
Depending on triggers (based on the battery) different profiles are loaded. Each trigger has different profiles depending of the the state of your phone (if it is locked, on battery, on power or a phone call is being done).
A profile can modify the following: * The CPU governor, its thresholds and min/max frequencies off your CPU (i.e. setCPU speed). * The state of services like: - mobiledata connection - 3G/2G switch - background sync - wifi - bluethooth - airplane mode
Configurations (i.e. a set of trigger and profiles) can be loaded based on the time of the day and the day of the week. This allows you to set a different behaviour during the night or the weekend.
In praise of CyanogenMod...
What's New V 3.4.2 * features - use "on battery" not "screen off" for "screen locked" - more translations