Sony VGN-Z790D - Manual (Page 113)

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Customizing Your VAIO Computer >
Selecting Performance Modes
❑ STAMINA mode
Uses the Intel Graphics Media Accelerator and disables some hardware devices on your computer to conserve battery
power.
❑ SPEED mode
Uses the NVIDIA video controller to provide faster performance.
!
The HDMI output port on your computer and the DVI-D port on the docking station are functional only when the computer is in SPEED mode.
✍
You can find the current performance mode by the indicator lights on either side of the performance selector switch.