PowerEdge XE9785L: After replacing the iDRAC Daughter Card (IDC), the slot numbering may appear incorrect

Summary: PowerEdge XE9785L: After replacing the iDRAC Daughter Card (IDC), the slot numbering may appear incorrect.

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Symptoms

After replacing the iDRAC Daughter Card (IDC), the slot numbering may appear incorrect.

In BIOS version 1.0.2: 

Cause

BIOS version 1.0.2 does not support the U.2 chassis configuration. The U.2 chassis switch firmware was not ready when the BIOS was released, causing missing Fully Qualified Device Descriptor (FQDD) mapping.

Resolution

Dell Engineering is aware of this issue, and it does not affect the operating system.
This issue is resolved in BIOS version 1.2.0, which adds support for U.2 chassis configuration and ensures proper FQDD mapping.  

Screenshot after issue fixed: 



 

 

Affected Products

PowerEdge XE9785L
Article Properties
Article Number: 000412328
Article Type: Solution
Last Modified: 21 Jan 2026
Version:  1
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