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4-62 User’s Manual
PORTÉGÉ M780
Enabling USB Sleep and Charge
This utility can be used to enable and disable the USB Sleep and Charge
function in groups. USB Sleep and Charge compatible USB ports are
assigned to each group.
Select the check boxes for each group to enable the USB Sleep and
Charge function for the USB ports assigned to that group. In the default
state all groups are disabled.
Power supply mode settings
Your PC has multiple charging modes so that many different USB devices
can be supported for USB Sleep and Charge function. Typical Mode
(Default) is suitable for a wide range of digital audio players.
However, determining which mode is suitable for your USB device is
unknown without trying. Try each mode, using the following procedure,
from Typical Mode to Alternate Mode(*1) to find the suitable mode for
your USB device to charge.
This function may not be able to be used with some connected external
devices even if the appropriate mode is selected. In this situation, clear the
“USB Sleep and Charge” check box and stop using this function.
*1. Some computers may not support all modes.
Battery Settings
This utility can be used to specify the lower limit of remaining battery life for
USB Sleep and Charge. Move the slider bar to specify the lower limit. If the
remaining battery life falls below the setting, the USB Sleep and Charge
function will be stopped. Selecting the “AC Only” check box sets the utility
to only charge when the AC adaptor is connected.
Heat dispersal
To protect against overheating, the processor is equipped an internal
temperature sensor which activates a cooling fan or lowers the processing
speed if the computer’s internal temperature rises to a certain level. You
are able to select whether to control this temperature by either turning on
the fan first, then if necessary lowering the processor speed, or by lowering
the processor speed first, then if necessary turning on the fan - these
functions are controlled within the Power Options.
When the processor’s temperature falls to a normal range, the fan will be
turned off and the processor operation returned to its standard speed.
If the processor’s temperature reaches an unacceptably high level with
either setting, the computer will automatically shuts down to prevent any
damage - in this instance all unsaved data in memory will be lost.