/proc/cpuinfo shows only 1 core on dual-core CPU [SOLVED]

I've recently gone from Arch i686 to Arch x86_64, and now /proc/cpuinfo shows only one core even though it's a dual-core CPU.
cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 23
model name : Intel(R) Core(TM)2 Duo CPU P8400 @ 2.26GHz
stepping : 6
cpu MHz : 2266.542
cache size : 3072 KB
physical id : 0
siblings : 1
core id : 0
cpu cores : 1
apicid : 0
initial apicid : 0
fpu : yes
fpu_exception : yes
cpuid level : 10
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc up arch_perfmon pebs bts rep_good aperfmperf pni dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm sse4_1 lahf_lm tpr_shadow vnmi flexpriority
bogomips : 4534.96
clflush size : 64
cache_alignment : 64
address sizes : 36 bits physical, 48 bits virtual
power management:
Have anyone experienced similar problems on x86_64?
Could it possibly be a kernel related error?
/AcId
Last edited by AcId (2010-09-08 21:33:27)

dmesg shows some iterensting info about "Unsupported number of siblings" ?
dmesg | grep CPU:
SMP: Allowing 1 CPUs, 0 hotplug CPUs
setup_percpu: NR_CPUS:16 nr_cpumask_bits:16 nr_cpu_ids:1 nr_node_ids:1
PERCPU: Embedded 29 pages/cpu @ffff880001800000 s88832 r8192 d21760 u2097152
SLUB: Genslabs=13, HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
RCU-based detection of stalled CPUs is disabled.
Verbose stalled-CPUs detection is disabled.
CPU: Unsupported number of siblings 2
mce: CPU supports 6 MCE banks
CPU0: Thermal monitoring enabled (TM2)
weird, boot CPU (#0) not listed by the BIOS.
Brought up 1 CPUs

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