SECOMX-945/N270
User Manual
- Rev. First Edition: 0.1 - Last Edition: 2.1 - Author: S.B. - Reviewed by G.M.
Copyright © 2011 SECO s.r.l.
SECOMX-945/N270
pag. 34
4.6 Power Management
After the selection of this submenu, it will appear the following table:
The selections above shown are an example and they can be different from the default values.
4.6.1 Power Failure Resume Type
This option allows determining how the board must act after a power failure event: in case the
option is “Always ON”, the board will start every time the power supply is present; when the option
is “Always OFF”, the board will not start automatically when the power supply returns.
Finally, if this option is set to “Last State”, the board will remember the state it had when the power
supply went down: so, if the board was on, it will start again when the power returns, and will
remain off if the board was in this state when the power went down.
4.6.2 Speed Step support
This option allows enabling or disabling Speed Step functionality, i.e. the possibility for the board to
vary CPU operative frequency, according to augmented or reduced workload, in order to decrease
power consumption when the CPU is not idle.
4.6.3 ACPI tables
This option allows enabling or disabling ACPI tables, used in power management from the
Operative System to administrate different power states.
4.6.4 C-State support
This option allows enabling or disabling
CPU’s C-State management, i.e. the possibility to define
different idle states for the CPU, from the lightest to the deepest sleep status. Increasing in sleep
status deepness, more and more zones of the CPU are disabled, so that power consumption
decrease significantly when CPU is not busy.
