Toshiba Portege R300 Maintenance Manual page 222

3 Tests and Diagnostics
(d) Front Buttons when Display Closed
This tab allows you to specify the action of the power button, TOSHIBA
Assist button, and TOSHIBA Presentation button while the internal display is
closed.
Enabled
When this option is selected, the power switch always works normally
regardless of whether the display is closed or not. (Default)
Disabled for battery use
When this option is selected, the power switch does not work when the AC
adaptor and power cord are not connected and the display is closed.
Disabled
When this option is selected, the power switch does not work when the
display is closed.
(e) Performance/Battery Life Setting
Battery operating time and computer processing power can be controlled by
changing the memory bus frequency.
Battery Life
Setting the memory bus frequency to 400MHz will give priority to battery
operating time over computer processing power.
Performance
Setting the memory bus frequency to 533MHz will give priority to computer
processing power over battery operating time (Default).
3-102 [CONFIDENTIAL] PORTEGE R300 Maintenance Manual (960-591)