PowerEdge: 16G - AC Recovery Feature Not Functioning as Expected

Summary: The AC recovery feature on certain PowerEdge 16G systems, such as the PowerEdge R760 and R760xs, does not function as intended when the initial BIOS version is either 2.2.7 or 2.2.8.

This article applies to This article does not apply to This article is not tied to any specific product. Not all product versions are identified in this article.
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Symptoms

  • When AC Power Recovery is set to Off, the expected behavior after a power loss and restoration is for the system to remain powered off. However, the result is that the system powers on after AC is restored.
  • When AC Power Recovery is set to Last, if the system is powered off (the last state), and then experiences a loss and restoration of AC power, the system powers on instead of remaining off.

PowerEdge Servers impacted:
PowerEdge R660
PowerEdge R660xs
PowerEdge R760
PowerEdge R760XA
PowerEdge R760xd2
PowerEdge R760xs

Cause

BIOS Versions 2.2.7 and 2.2.8 introduced a change that removed the AC recovery defaults from the BIOS, transferring ownership to the BMC. This modification disrupted the NVRAM attribute synchronization logic.

Starting with BIOS version 2.3.5, the BIOS synchronizes the Intelligent Platform Management Interface (IPMI) settings back to NVRAM if they are not already initialized.

Resolution

  • Update the BIOS to version 2.3.5 or later.

For specific projects that require the BIOS to remain at versions 2.2.7 or 2.2.8:

  1. Update the BIOS to version 2.3.5 or later.
  2. Roll back the BIOS to version 2.2.7 or 2.2.8.

Note: Once the BIOS is updated to version 2.3.5 or later, the relevant NVRAM attributes are successfully initialized. Downgrading the BIOS to version 2.2.7 or 2.2.8 does not clear these attributes, as they remain retained in NVRAM.

Additional Information

Which generation does my PowerEdge server belong to?

PowerEdge: Servers by generation

Affected Products

Telecom Infrastructure Block for Red Hat PowerEdge R660 Controller, Telecom Infrastructure Block for Red Hat PowerEdge R660 Automation Node, OEMR R660, OEMR XL R660, OEMR R660xs, OEMR R760, OEMR R760xa, OEMR R760XD2, OEMR XL R760, OEMR R760xs , OEMR XL R660xs, OEMR XL R760xs, PowerEdge R660, PowerEdge R660xs, PowerEdge R760, PowerEdge R760XA, PowerEdge R760xd2, PowerEdge R760xs, PowerFlex appliance R660, PowerFlex appliance R760, PowerFlex custom node R660, PowerFlex custom node R760, Telecom Infrastructure Block for Red Hat PowerEdge R660 Compute or Storage Node, Telecom Infrastructure Block For Red Hat PE R660 Provisioner, Telecom Infrastructure Block for Red Hat PowerEdge R760 Compute or Storage Node, vSAN Ready Node R660, Dell EMC vSAN R760 Ready Node ...
Article Properties
Article Number: 000379434
Article Type: Solution
Last Modified: 05 مارس 2026
Version:  3
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