Fujitsu FPCM20654 User Guide - Page 38

LifeBook P Series Notebook/Tablet PC Power Management Your LifeBook P Series notebook/Tablet PC has many options and features for conserving battery power. Some of these features are automatic and need no user intervention, such as those for the internal modem. However, others depend on the parameters you set to best suit your operating conditions, such as those for the display brightness. Internal power management for your notebook/Tablet PC may be controlled from settings made in your operating system, pre-bundled power management application, or from settings made in BIOS setup utility. Besides the options available for conserving battery power, there are also some things that you can do to prevent your system battery from running down as quickly. For example, you can create an appropriate power saving profile, put your system into Standby mode when it is not performing an operation, and you can limit the use of high power devices. As with all mobile, battery powered computers, there is a trade-off between performance and power savings. Power Mode Fully On Mode Standby Mode (Suspend-to-RAM) Hibernation Mode (Suspend-to-Disk) Power Off System Activity System is running. CPU, system bus, and all other interfaces operate at full speed. Resume system logic remains powered and RAM remains powered to maintain active data. All other devices are turned off. Windows saves desktop state (including open files and documents) to hard disk. CPU stops. All other devices are turned off. System is fully powered off except for logic components required for Suspend/ Resume button and real-time clock operation. Events causing system to enter mode state ■ From Standby mode: System operation resumed (Suspend/Resume button pressed, resume on modem ring, resume on time). ■ From Hibernation mode: Suspend/Resume button pressed. ■ From Off mode: Suspend/Resume button pressed. ■ Standby timeout occurs. ■ Suspend request issued by software or by pressing the Suspend/Resume button. ■ Low battery. ■ Suspend timeout occurs. ■ Clicking Start -> Shut Down -> Hibernate (It may be necessary to Enable Hibernate Support from Windows Power Options.) ■ Low battery condition ■ System shutdown. ■ Low battery condition Table 3-1. System Power States SUSPEND/RESUME BUTTON When your notebook/Tablet PC is active, the Suspend/ Resume button can be used to manually put your system into Standby mode. Push the Suspend/Resume button when your notebook/Tablet PC is active, but not actively accessing anything, and immediately release the button. You will hear two short beeps and your system will enter Standby mode. (See figure 2-6 on page 11 for location). If your notebook/Tablet PC is suspended, pushing the Suspend/Resume button will return your system to active operation. You can tell whether or not your system is in Standby mode by looking at the Power indicator. See "" on page 14. If the indicator is visible and not flashing, your system is fully operational. If the indicator is both visible and flashing, your system is in Standby mode. If the indicator is not visible at all, the power is off or your system is in Hibernate mode (See Hibernate Mode) 32 STANDBY MODE Standby mode in Windows saves the contents of your notebook/Tablet PC's system memory during periods of inactivity by maintaining power to critical parts. This mode will turn off the CPU, the display, the hard drive, and all of the other internal components except those necessary to maintain system memory and allow for restarting. Your system can be put in Standby mode by: ■ Pressing the Suspend/Resume button when your system is turned on. ■ Selecting Standby from the Windows Shut Down menu. ■ Timing out from lack of activity. ■ Allowing the battery to reach the Dead Battery Warning condition. ■ Closing the system cover. Your notebook/Tablet PC's system memory typically stores the file(s) on which you are working, open application(s) information, and any other data required to support the operation(s) in progress. When you resume