Specification

Intel Compute Stick STCK1AW32SC and STCK1A32SC Technical Product Specification
14
1.11.1 ACPI
ACPI gives the operating system direct control over the power management and Plug and Play
functions of a computer. The use of ACPI with the Intel Compute Stick requires an operating
system that provides full ACPI support. ACPI features include:
• Plug and Play (including bus and device enumeration)
• Power management control of individual devices
Table 3 lists the system states based on how long the power switch is pressed, depending on how
ACPI is configured with an ACPI-aware operating system.
Table 3. Effects of Pressing the Power Switch
If the system is in this state…
…and the power switch is pressed for
…the system enters this state
Off
(ACPI G2/G5 – Soft off)
Less than four seconds Power-on
(ACPI G0 – working state)
On
(ACPI G0 – working state)
More than six seconds Fail safe power-off
(ACPI G2/G5 – Soft off)
Note: Depending on power management settings in the operating system.
1.11.1.1 System States and Power States
Under ACPI, the operating system directs all system and device power state transitions. The
operating system puts devices in and out of low-power states based on user preferences and
knowledge of how devices are being used by applications. Devices that are not being used can be
turned off. The operating system uses information from applications and user settings to put the
system as a whole into a low-power state.
Table 4 lists the power states supported by the Intel Compute Stick along with the associated
system power targets. See the ACPI specification for a complete description of the various system
and power states.
Table 4. Power States and Targeted System Power
Global States Sleeping States Processor States Device States
Targeted System
Power
(Note 1)
G0 – working
state
S0 – working C0 – working D0 – working
state.
Full power
G2/S5 S5 – Soft off. Context
not saved. Cold boot
is required.
No power D3 – no power
except for
wake-up logic.
Power < 5 W
(Note 2)
G3 – mechanical
off
AC power is
disconnected
from the
computer.
No power to the
system.
No power D3 – no power for
wake-up logic.
No power to the system.
Service can be performed
safely.
Notes:
1. Total system power is dependent on the system configuration and peripherals powered by the system power supply.
2. Dependent on the standby power consumption of wake-up devices used in the system.