IBM Support

CPU diagnostics hang with USB device attached - Servers

Troubleshooting


Problem

The system freezes while running onboard diagnostics on the Central Processing Unit (CPU). This problem may occur when running the diagnostics locally at the console or remotely through an Remote Supervisor Adapter (RSA). The system has USB devices attached which are typically mice and/or keyboards.

Resolving The Problem

Source

RETAIN tip: H187139

Symptom

The system freezes while running onboard diagnostics on the Central Processing Unit (CPU).

This problem may occur when running the diagnostics locally at the console or remotely through an Remote Supervisor Adapter (RSA).

The system has USB devices attached which are typically mice and/or keyboards.

Affected configurations

The system may be any of the following IBM servers:

  • System x3800, Type 8865, any model
  • System x3850, Type 8863, any model
  • System x3950, Type 8872, any model
  • System x3950 E, Type 8874, any model
  • xSeries 260, Type 8865, any model
  • xSeries 366, Type 8863, any model
  • xSeries 460, Type 8872, any model
  • xSeries MXE 460, Type 8874, any model

This tip is not option specific.

This tip is not software specific.

Solution

A fix is included in BIOS version 1.11, build ID ZUE165A and higher.

The file will be available from the IBM System x Support web site at the following URL:

http://www.ibm.com/systems/support/
Workaround

Do not use a USB keyboard, mouse, or any other USB devices while CPU diagnostics are running.

Additional information

During some routines of the CPU diagnostics, the processors are put to sleep. If USB interrupts occur while the processors are inactive, the system may hang inadvertently. In BIOS versions prior to 1.11, avoiding activity from USB keyboards and mice avoids the hang condition.

In BIOS version 1.11, a change was made to the BIOS interrupt routines that permits USB activity while the CPU's are inactive.

 

Document Location

Worldwide

Operating System

System x:Operating system independent / None

Older System x:Operating system independent / None

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Document Information

Modified date:
29 January 2019

UID

ibm1MIGR-65097

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