Sony PCG-K315B Hardware Manual page 60

If you have a mobile CPU (see the printed Specifications sheet), a CPU control icon may appear on the taskbar. The CPU control icon indicates the CPU control
status (Performance, Adaptive, Battery Life, Degrade). To make the icon appear, click the Advanced button on the VAIO Power Management tab. Select the Show
CPU status icon in the taskbar box and then click OK.
If you want to know more about the CPU control icon, read the online help file (Other Information - Icons on the Notification Area).
Restoring the default settings
The power scheme settings that you changed on the VAIO Power Management tab can be restored to the default settings.
To restore the default settings, proceed as follows:
1 Select the VAIO Power Management tab in the Power Options Properties window.
2 Click the Advanced button.
The VAIO Power Management window appears.
3 Click the Reset by default button.
The Confirm window appears.
4 Select the Restore all power schemes to the original factory default settings.
5 Click OK.
The Confirm window closes and the default settings are restored for all the power scheme options.
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Using your VAIO computer