IBASE SI-28 - Manual (Page 31)

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Video Off Method
This field defines the Video Off features. There are three options.
V/H SYNC + Blank: Default setting, blank the screen and turn off vertical and
horizontal scanning.
DPMS: Allows BIOS to control the video display.
Blank Screen: Writes blanks to the video buffer.
Soft-Off by PWRBTN
This field defines the power-off mode when using an ATX power supply. The Instant
Off mode allows powering off immediately upon pressing the power button. In the
By Hardware mode, the system powers off when the power button is pressed for
more than four seconds or enters the suspend mode when pressed for less than 4
seconds.
HPET Support
HPET, or High Precision Event Timer (formerly known as Multimedia Timer) is a
hardware timer that is supported under Linux and Windows Vista. It can produce
periodic interrupts at a much higher resolution than the RTC and is often used to
synchronize multimedia streams, providing smooth playback and reducing the need
to use other timestamp calculations such as an x86 CPU ’s RDTSC instruction.