![]() Lowest-power sleep mode and takes the longest to come up. Some info in RAM is restored to CPU and cache. ![]() System is restored instantly upon user intervention. Hard disks are not running.ĬPU is not powered. Requires less power than the G0 state and has multiple sleeping states: S1, S2, S3, and S4.ĬPU is still powered, and unused devices are powered down. Software, such as the autosave function used with Microsoft products, can be optimized for performance or lower battery usage. ACPI has various operating states, as shown in Table 4.3. The CPU clock can be throttled or slowed down to keep the temperature lower and prolong the life of the CPU and reduce power requirements especially in portable devices when activity is low or nonexistent. The power supply can be adjusted for power requirements. Case temperatures, CPU temperatures, and CPU fans can be monitored. For example, the Instant On/Off BIOS setting can control how long the power switch is held in before the power supply turns on or off. With ACPI, the user can control how the power switch operates and when power to specific devices, such as the hard drive and monitor, is lowered.
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