Service manual

8258I N/B Maintenance

1.4 Power Management

The 8258I system has built in several power saving modes to prolong the battery usage for mobile purpose. User can

enable and configure different degrees of power management modes via ROM CMOS setup (booting by pressing F2

key). Following are the descriptions of the power management modes supported

1.4.1 System Management Mode

For more power saving, it turns of the peripheral components. In this mode, the following is the status of each

device:

- CPU: Stop grant

- LCD: Backlight off

 Full on mode

In this mode, each device is running with the maximal speed. CPU clock is up to its maximum.

 Doze mode

In this mode, CPU will be toggling between on & stop grant mode either. The technology is clock throttling.

This can save battery power without loosing much computing capability. The CPU power consumption and

temperature is lower in this mode.

 Standby mode

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