Bug 249888
Summary: | kernel cannot detect both cores in dual-core CPU if "acpi=off" is used at boot | ||
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Product: | [Fedora] Fedora | Reporter: | NILMONI DEB <ndeb> |
Component: | kernel | Assignee: | Kernel Maintainer List <kernel-maint> |
Status: | CLOSED NOTABUG | QA Contact: | Fedora Extras Quality Assurance <extras-qa> |
Severity: | high | Docs Contact: | |
Priority: | low | ||
Version: | 7 | ||
Target Milestone: | --- | ||
Target Release: | --- | ||
Hardware: | i686 | ||
OS: | Linux | ||
Whiteboard: | |||
Fixed In Version: | Doc Type: | Bug Fix | |
Doc Text: | Story Points: | --- | |
Clone Of: | Environment: | ||
Last Closed: | 2007-07-30 15:09:55 UTC | Type: | --- |
Regression: | --- | Mount Type: | --- |
Documentation: | --- | CRM: | |
Verified Versions: | Category: | --- | |
oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
Cloudforms Team: | --- | Target Upstream Version: | |
Embargoed: |
Description
NILMONI DEB
2007-07-27 17:46:57 UTC
Similar problems have been reported on Fedora 7 by others -> http://forums.fedoraforum.org/showthread.php?p=822704 This problem (detecting only 1 out of 2 cores) appeared when I booted the kernel with "acpi=off" option (originally needed for kernel-2.6.21-1.3194.fc7 due to bug 241249). I have verified now that this option is not needed for the kernel-2.6.22.1-33.fc7 to boot successfully. It seems that use of "acpi=off" is preventing the detection of both cores. If this option is not used then both cores are detected fine. Detection of multiple processors requires ACPI on modern machines. Booting with kernel option "acpi=ht" might work by enabling only enough ACPI to detect the CPUs. |