Bug 173956 - Only 1 CPU is working
Only 1 CPU is working
Product: Red Hat Enterprise Linux 4
Classification: Red Hat
Component: kernel (Show other bugs)
i686 Linux
medium Severity high
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Assigned To: Jim Paradis
Brian Brock
Depends On:
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Reported: 2005-11-22 19:13 EST by oliver b.
Modified: 2013-08-05 21:17 EDT (History)
3 users (show)

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Fixed In Version:
Doc Type: Bug Fix
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Last Closed: 2005-11-25 07:21:56 EST
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Description oliver b. 2005-11-22 19:13:26 EST
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Description of problem:
My system (IBM IntelliStation Pro M) is only working with one cpu. There are two HT enabled cpus inside (they're working correctly with other OS'). The system runs AS4 U1 with update to U2 (up2date -u).

/proc/cpuinfo shows only one cpu. top also do.

For booting up the system I need to use the acpi=off kernel option. If not the system can't recognize the scsi-drives and seems to hang.

The last trest with AS3 U5 (acpi worked fine!) top showed me all 4 cpus.

Version-Release number of selected component (if applicable):
kernel-2.6.9-22.0.1EL, kernel-utils-2.4-13.1.69, acpid-1.0.3-2

How reproducible:

Steps to Reproduce:
1. Install AS4 U1
2. Update to U2

Actual Results:  System works with only one cpu.

Expected Results:  System should work with all four cpus and show them all.

Additional info:

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