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Thread: Ubuntu 12.04 just recognizes one processor

  1. #11
    Join Date
    Jun 2007
    Beans
    11,525

    Re: Ubuntu 12.04 just recognizes one processor

    A BIOS update could fix it, but Asus' site is being painfully uncooperative for me at the moment, so I can't check the changelog.

  2. #12
    Join Date
    Feb 2013
    Beans
    9

    Re: Ubuntu 12.04 just recognizes one processor

    Quote Originally Posted by Temüjin View Post
    A BIOS update could fix it, but Asus' site is being painfully uncooperative for me at the moment, so I can't check the changelog.
    I figured out that the motherboard is already runing with the latest BIOS version:
    http://support.asus.com/download.asp...IElEVsZT8ok6lq

  3. #13
    Join Date
    Jun 2011
    Beans
    417
    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: Ubuntu 12.04 just recognizes one processor

    Quote Originally Posted by Plinio Santos View Post
    I installed Ubuntu 12.04 LTE in a machine that has an intel i3 processor. As far as I know, i3 processor is a multicore one and the OS should recognize 2 processors, just as Windows 7 does. Ubuntu 12 isn't recognizing it though. Is it a know issue? Have I missed some configuration?

    the output of
    Code:
    $ cat /proc/cpuinfo
    is:
    Code:
    processor       : 0
    vendor_id       : GenuineIntel
    cpu family      : 6
    model           : 37
    model name      : Intel(R) Core(TM) i3 CPU         530  @ 2.93GHz
    stepping        : 2
    microcode       : 0x9
    cpu MHz         : 2933.374
    cache size      : 4096 KB
    physical id     : 0
    siblings        : 1
    core id         : 0
    cpu cores       : 1
    apicid          : 0
    initial apicid  : 0
    fpu             : yes
    fpu_exception   : yes
    cpuid level     : 11
    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 rdtscp lm constant_tsc up arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm sse4_1 sse4_2 popcnt lahf_lm arat dtherm tpr_shadow vnmi flexpriority ept vpid
    bogomips        : 5866.74
    clflush size    : 64
    cache_alignment : 64
    address sizes   : 36 bits physical, 48 bits virtual
    power management:
    [ EDIT ]
    Adding new info. The output of
    Code:
    $ lscpu
    is:
    Code:
    Architecture:          x86_64
    CPU op-mode(s):        32-bit, 64-bit
    Byte Order:            Little Endian
    CPU(s):                1
    On-line CPU(s) list:   0
    Thread(s) per core:    1
    Core(s) per socket:    1
    Socket(s):             1
    NUMA node(s):          1
    Vendor ID:             GenuineIntel
    CPU family:            6
    Model:                 37
    Stepping:              2
    CPU MHz:               2933.196
    BogoMIPS:              5866.39
    Virtualization:        VT-x
    L1d cache:             32K
    L1i cache:             32K
    L2 cache:              256K
    L3 cache:              4096K
    NUMA node0 CPU(s):     0
    Looking at your posted /proc/cpuinfo both cores got detected (0+1 but HT is missing) but what I can not find whether you have installed i386 or amd64 version of 12.04 LTS. That will be interesting and a complete dump of your dmesg.

    dmesg > dmesg.txt

    As you have this cpu: http://ark.intel.com/products/46472/...Cache-2_93-GHz

    also HT is not shown as you should have dual core + 2 HT = 4.

  4. #14
    Join Date
    Feb 2013
    Beans
    9

    Re: Ubuntu 12.04 just recognizes one processor

    Quote Originally Posted by Gyokuro View Post
    Looking at your posted /proc/cpuinfo both cores got detected (0+1 but HT is missing) but what I can not find whether you have installed i386 or amd64 version of 12.04 LTS.
    I'm using amd64 version.

    That will be interesting and a complete dump of your dmesg.

    dmesg > dmesg.txt
    Log attached.
    Attached Files Attached Files

  5. #15
    Join Date
    Apr 2006
    Beans
    23

    Re: Ubuntu 12.04 just recognizes one processor

    I believe this is your problem:

    Code:
    [    0.000000] ACPI: No APIC-table, disabling MPS
    [    0.000000] ACPI: HPET id: 0x8086a701 base: 0xfed00000
    [    0.000000] SMP: Allowing 1 CPUs, 0 hotplug CPUs
    can you try passing acpi=off to grub and check the results?

  6. #16
    Join Date
    Apr 2006
    Beans
    23

    Re: Ubuntu 12.04 just recognizes one processor

    Quote Originally Posted by Plinio Santos View Post
    Power: I think it does not matter, but how knows...
    all config related with ACPI (around 4 config options) - disabled
    Also, did you have this off or did you turn off the ACPI to find the cause of the missing cores in linux?

  7. #17
    Join Date
    Feb 2013
    Beans
    9

    Re: Ubuntu 12.04 just recognizes one processor

    Quote Originally Posted by beejee View Post
    ... did you have this off or did you turn off the ACPI to find the cause of the missing cores in linux?
    Those configs have always being set to disable.

    I cant reboot this machine right now But will test with these changes and post the results as soon as possible, including use acpi=off in kernel command line.

  8. #18
    Join Date
    Feb 2013
    Beans
    9

    Re: Ubuntu 12.04 just recognizes one processor

    Quote Originally Posted by beejee View Post
    Also, did you have this off or did you turn off the ACPI to find the cause of the missing cores in linux?
    Uhuu! Amazing inside!
    I enabled ACPI options in BIOS power section and Ubuntu is recognizing 4 CPUs now!

    Thanks every one!

    Code:
    $ lscpu
    Architecture:          x86_64
    CPU op-mode(s):        32-bit, 64-bit
    Byte Order:            Little Endian
    CPU(s):                4
    On-line CPU(s) list:   0-3
    Thread(s) per core:    2
    Core(s) per socket:    2
    Socket(s):             1
    NUMA node(s):          1
    Vendor ID:             GenuineIntel
    CPU family:            6
    Model:                 37
    Stepping:              2
    CPU MHz:               1200.000
    BogoMIPS:              5866.47
    Virtualization:        VT-x
    L1d cache:             32K
    L1i cache:             32K
    L2 cache:              256K
    L3 cache:              4096K
    NUMA node0 CPU(s):     0-3

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