Public bug reported:
Binary package hint: linux-image-2.6.24-15-generic
This bug was present in Gutsy, I upgraded to Hardy to see if it had been
resolved but it is still present. I have an AMD Athlon64 x2 5600+, which
worked fine on my previous motherboard. I changed my motherboard to an
ECS AMD690GM-M2 and now only one core works in Ubuntu, both cores are
recognised in Windows. I have tried various things found via google.
Booting with noapic makes no difference. acpi=off and acpi=ht result in
an unbootable system. Disabling HPET in the bios makes no difference.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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Only one core working on dual core CPU
https://bugs.launchpad.net/bugs/215785
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