Technical Advisory 949

This Technical Advisory describes an issue which may or may not affect the customer’s product
Intel Technical Advisory TA-0949-1
5200 NE Elam Young Parkway
Hillsboro, OR 97124
April 20, 2010
Copyright © 2010 Intel Corporation. * Other names and brands may be claimed as the property of others.
Onboard and add-in Devices re-enumerate after BIOS update to BIOS
45 or later.
Information in this document is provided in connection with Intel products. No license, express or implied, by estoppel or otherwise,
to any intellectual property rights is granted by this document. Except as provided in Intel's Terms and Conditions of Sale for such
products, Intel assumes no liability whatsoever, and Intel disclaims any express or implied warranty, relating to sale and/or use of
Intel products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent,
copyright or other intellectual property right. Intel products are not intended for use in medical, life saving, or life sustaining
applications. Intel may make changes to specifications and product descriptions at any time, without notice. The Intel products
described herein may contain design defects or errors known as errata which may cause the product to deviate from published
specifications. Current characterized errata are available on request.
Products Affected
• S5520UR • S5520HC
• SR1600UR • S5520HCT
• SR1600URHS • S5500HCV
• SR1625UR • S5520SC
• SR1625URSAS • SC5650HCBRP
• SR2600URBRP • SC5650SCWS
• SR2600URLX • S5520HC
• SR2625URBRP • S5520HCT
• SR2625URBRP • S5500WB
• SR2625URLX • S5500WB12V
• SR2625URSAS • SR1690WB
• SR2600URSATA • SR2612UR
Description
S5500.86B.01.00.0045.11232009 (BIOS 45) has a change in the ACPI table which will cause a re-enumeration of
onboard and add-in devices. Systems upgrading the system BIOS prior to BIOS 45 such as BIOS 43 to BIOS 45 or later
such as BIOS 46, will see a re-enumeration of onboard and add-in devices under the following operating systems:
Microsoft* Windows 2003 R2 SP2, Microsoft* Windows 2008 SP2, Microsoft* Windows 2008 R2, VMWare* ESX 3.5,
VMWare* ESXi 3.5, VMWare* 4.0, and VMWare* ESXi 4.0. The following changes have been observed during the re-
enumeration process:
i. Video Resolution may reset to a lower video resolution (Microsoft* Windows 2003 only)
ii. System devices automatically reload drivers. A system restart may be required after driver reload.