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Thread: ubuntu 18.04 on Chillblast laptop (dual boot) sees only 1 CPU

  1. #1
    Join Date
    Jun 2019

    Exclamation ubuntu 18.04 on Chillblast laptop (dual boot) sees only 1 CPU

    Dear Community,

    I have set up a dual boot on this laptop here, using this Ubuntu Desktop 18.04 here. The C:\\ disk (240GB) is taken by Windows 10, and about half the disk D:\\ (1TB) is taken by ubuntu ( "/"=400GB, "Swap"=64GB), and the boot loader is from the windows one.

    In the boot loader, I had to set acpi=off option in to let ubuntu start, and after installation I saved that option in /etc/defaults/grub then did sudo update-grub. This guarantees me the the system starts or switches off when I choose to use Ubuntu instead of Windows.

    The computer runs very slow, so I tried to type nproc, and it's equal to 1 (should be 12, as it is on windows). Same result with cat /proc/cpuinfo
    $ cat /proc/cpuinfo
    processor    : 0
    vendor_id    : GenuineIntel
    cpu family    : 6
    model        : 158
    model name    : Intel(R) Core(TM) i7-8750H CPU @ 2.20GHz
    stepping    : 10
    microcode    : 0xb4
    cpu MHz        : 3900.001
    cache size    : 9216 KB
    physical id    : 0
    siblings    : 1
    core id        : 0
    cpu cores    : 1
    apicid        : 0
    initial apicid    : 0
    fpu        : yes
    fpu_exception    : yes
    cpuid level    : 22
    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 pdpe1gb rdtscp lm constant_tsc art arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf tsc_known_freq pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch cpuid_fault epb invpcid_single pti ssbd ibrs ibpb stibp tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid mpx rdseed adx smap clflushopt intel_pt xsaveopt xsavec xgetbv1 xsaves dtherm ida arat pln pts hwp hwp_notify hwp_act_window hwp_epp md_clear flush_l1d
    bugs        : cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf mds
    bogomips    : 4416.00
    clflush size    : 64
    cache_alignment    : 64
    address sizes    : 39 bits physical, 48 bits virtual
    power management:
    What can I do ?

  2. #2
    Join Date
    Jan 2006
    Sunny Southend-on-Sea
    Kubuntu 18.04 Bionic Beaver

    Re: ubuntu 18.04 on Chillblast laptop (dual boot) sees only 1 CPU

    The reason is likely because you've crippled the interface to the hardware by using acpi=off. That is brutal. You've not said why you thought you needed to do that, nor which other things you'd tried first. There are many gentler Grub options that will let you retain the functionality that you've currently decided to turn off.

  3. #3
    Join Date
    Jun 2009
    SW Forida

    Re: ubuntu 18.04 on Chillblast laptop (dual boot) sees only 1 CPU

    For more info on UEFI boot install & repair - Regularly Updated :
    Please use Thread Tools above first post to change to [Solved] when/if answered completely.

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