Ubuntu em macbook 5,2

[zekideia]

Ola a todos. Eu instalei o Ubuntu Studio 11.10 em meu MacBook 5,2 e tenho enfrentado o seguinte problema: tenho um processador de dois nucleos (intel core 2 duo) mas o sistema reconhece apenas 1. O que faco? Ja segui alguns tutoriais na internet, ja mexi em arquivos e opcoes de boot e recompilei o kernel, mas o problema persiste.  Alguem teria alguma soucao para esse tipo de problema? Agradeco desde ja.

Seguem os dados do cpuinfo:
processor   : 0
vendor_id   : GenuineIntel
cpu family   : 6
model      : 23
model name   : Intel(R) Core(TM)2 Duo CPU     P7450  @ 2.13GHz
stepping   : 10
cpu MHz      : 1596.000
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   : 13
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 arch_perfmon pebs bts rep_good nopl aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm sse4_1 xsave lahf_lm dts tpr_shadow vnmi flexpriority
bogomips   : 4255.97
clflush size   : 64
cache_alignment   : 64
address sizes   : 36 bits physical, 48 bits virtual
power management:


E algumas informacoes do dmesg para o SMP:
[    0.072003] smpboot cpu 1: start_ip = 9a000
[    0.016000] Kernel panic - not syncing: smp_callin: CPU1 started up but did not get a callout!

Tambem com relacao a cpu:
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpu
[    0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-3.0.9 root=UUID=f0b99431-bd8a-4fce-8387-16641e71f0d8 ro crashkernel=384M-2G:64M,2G-:128M quiet splash maxcpus=2 vt.handoff=7
[    0.000000] KERNEL supported cpus:
[    0.000000] x86 PAT enabled: cpu 0, old 0x7040600070406, new 0x7010600070106
[    0.000000] setup_percpu: NR_CPUS:256 nr_cpumask_bits:256 nr_cpu_ids:2 nr_node_ids:1
[    0.000000] PERCPU: Embedded 28 pages/cpu @ffff88007e600000 s83584 r8192 d22912 u1048576
[    0.000000] pcpu-alloc: s83584 r8192 d22912 u1048576 alloc=1*2097152
[    0.000000] pcpu-alloc:

• 0 1
  [    0.000000] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-3.0.9 root=UUID=f0b99431-bd8a-4fce-8387-16641e71f0d8 ro crashkernel=384M-2G:64M,2G-:128M quiet splash maxcpus=2 vt.handoff=7
  [    0.017853] Initializing cgroup subsys cpuacct
  [    0.072003] smpboot cpu 1: start_ip = 9a000
  [    5.276387] HPET: 4 timers in total, 0 timers will be used for per-cpu timer
  [    5.549695] ACPI: acpi_idle registered with cpuidle
  [    5.706577] cpuidle: using governor ladder
  [    5.706823] cpuidle: using governor menu