NCR VOYIX CX7 - Page 191

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191
Note
When the terminal resumes from an S3 state, all the USB devices re-
enumerate. This causes speaker tones as if they were disconnected and then
reconnected. This does not present a problem and the USB devices will
continue to operate correctly.
Requirements for S3 support:
l
O/S must be built on a system with S3 enabled in the BIOS
l
Some peripherals may not be S3 capable, which can prevent the system from
entering S3 state.
l
S4 (Suspend to Disk): The S4 state is the lowest power, longest wake latency
sleeping state supported by ACPI. In order to reduce power to a minimum, it is
assumed that the hardware platform has powered off all devices. Platform context is
maintained.
Requirements for S4 support:
l
O/S must be built on a system with S3 enabled in the BIOS
l
Some peripherals may not be S4 capable, which can prevent the system from
entering S4 state.
Reference the ACPI Specification for details.
Peripherals: ACPI defines power states for peripherals which are separate from the
system power state. The device power states range from D0 (fully-on) to D3 (off) It is
the responsibility of the driver developer for each peripheral to define and support
the available power states.
Power State S0 Working S0 Idle,
Backlight
Off,
SSDIdle
S3 Suspend
to RAM
S4
Hibernate
S5 Soft
Off
S0 Idle,
Backlight
on
Supported:
Y/N
Y Y Y Y Y Y