Dell Latitude E7470 Owner's Manual page 33

Option Description
This field configures the integrated USB controller. If Boot Support is enabled, the
system is allowed to boot any type of USB Mass Storage Devices (HDD, memory
key, floppy).
If USB port is enabled, device attached to this port is enabled and available for OS.
If USB port is disabled, the OS cannot see any device attached to this port.
The options are:
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USB PowerShare This field configures the USB PowerShare feature behavior. This option allows you
to charge external devices using the stored system battery power through the USB
PowerShare port.
Audio This field enables or disables the integrated audio controller. By default, the Enable
Audio option is selected. The options are:
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Keyboard This field lets you choose the operating mode of the keyboard illumination feature.
Illumination The keyboard brightness level can be set from 0% to 100%. The options are:
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Keyboard The Keyboard Backlight with AC option does not affect the main keyboard
Backlight with AC illumination feature. Keyboard Illumination will continue to support the various
illumination levels. This field has an effect when the backlight is enabled.
Keyboard The Keyboard Backlight Timeout dims out with AC option. The main keyboard
Backlight Timeout illumination feature is not affected. Keyboard Illumination will continue to support
with AC the various illumination levels. This field has an effect when the backlight is
enabled.
Keyboard The Keyboard Backlight Timeout dims out with Battery option. The main keyboard
Backlight Timeout illumination feature is not affected. Keyboard Illumination will continue to support
on Battery the various illumination levels. This field has an effect when the backlight is
enabled.
Enable USB Boot Support (by default enable)
Enable External USB Port (by default enable)
Enable Thunderbolt Port (by default enable).
Enable Thunderbolt Boot Support. This is an optional feature.
Always Allows Dell Docks. This is an optional feature.
Enables Thunderbolt (and PCIe behind TBT) Pre-boot
NOTE: USB keyboard and mouse always work in the BIOS setup irrespective of
these settings.
Enable Microphone (by default enable)
Enable Internal Speaker (by default enable)
Disabled
Dim
Bright (enabled by default)
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