Intel core 2 duo (ACPI=off -> only one CPU found)

[James Wilkinson]

Anderson Alipio wrote:
> I have one Intel Core 2 Duo 1.86GHz with motherboard Intel D946GZIS and 2GB 
> Dual Channel.
> 
> When the system is booting, it crash checking the ACPI, not even the keyboard 
> works, it stops with no message.
> 
> When I pass the kernel option "acpi=off", it works fine, but found only one 
> CPU.
> 
> I also tried to boot with other Hard drive that already have Fedora 2 with SMP 
> installed (it is working in other machine with 2 P.III 1GHz processors)
> but only boots with "acpi=off".
> 
> Did anyone had this same problem? Is there a way to solve this without 
> "acpi=off"? can it be a motherboard problem?

Almost certainly a motherboard problem -- the ACPI tables are part of
the BIOS, which is held on the motherboard.

Try looking for an update. Or try apci=ht : this is documented to be the
minimum necessary to get a Pentium 4 with hyperthreading to actually
hyperthread, so it might get you running with two cores.

Also try pci=noacpi and acpi=noirq.

Hope this helps,

James.

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