Technical Product Specification

Intel® Server Boards S4600LH2/T2 TPS
Revision 2.0
177
Note: If “Reset on ERR2” is Disabled, this can result in a system hang for certain error conditions,
possibly with the system unable to update the System Status LED or log an error to the SEL before
hanging.
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]
5. Resume on AC Power Loss
Option Values: Stay Off
Last State
Power On
Help Text:
System action to take on AC power loss recovery.
[Stay Off] - System stays off.
[Last State] - System returns to the same state before the AC power loss.
[Power On] - System powers on.
Comments: This option controls the policy that the BMC will follow when AC power is
restored after an unexpected power outage. The BMC will either hold DC power off or always turn it on
to boot the system, depending on this setting – and in the case of Last State, depending on whether
the power was on and the system was running before the AC power went off.
When this setting is changed in Setup, the new setting will be sent to the BMC. However, the BMC
maintains (“owns”) this Power Restore Policy setting, and it can be changed independently with an IPMI
command to the BMC. BIOS gets this setting from the BMC early in POST, and also for the Setup
Server Management screen.
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]
6. Power Restore Delay
Option Values: Disabled
Auto
Fixed
Help Text:
Allows a delay in powering up after a power failure, to reduce peak power requirements. The
delay can be fixed or automatic between 25-300 seconds.
Comments: When the AC power resume policy (above) is either Power On or Last State,
this option allows a delay to be taken after AC power is restored before the system actually begins to
power up. This delay can be either a fixed time or an “automatic” time, where “automatic” means that
the BIOS will select a randomized delay time of 25-300 seconds when it sends the Power Restore
Delay setting to the BMC.
This option will be grayed out and unavailable when the AC power resume policy is Stay Off.
The Power Restore Delay setting is maintained by BIOS. This setting does not take effect until a reboot
is done. Early in POST, the Power Restore Policy is read from the BMC, and if the policy is Power On
or Last State, the delay settings are sent to the BMC.
Bear in mind that even if the Power Restore Delay is Disabled, there will still be a delay of about 20
seconds while the BMC itself boots up after AC power is restored.
Note: This Power Restore Delay option applies only to powering on when AC is applied. It has no effect
on powering the system up using the Power Button on the Front Panel. A DC power on using the
Power Button is not delayed.