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[Bug 1411884] Re: not all CPU cores loaded during boot


Frans Elliott, thank you for reporting this and helping make Ubuntu better. Could you please execute the following command, as it will automatically gather debugging information, in a terminal:
apport-collect 1411884

** Package changed: linux-lts-utopic (Ubuntu) => linux (Ubuntu)

** Changed in: linux (Ubuntu)
   Importance: Undecided => Low

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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  not all CPU cores loaded during boot

Status in linux package in Ubuntu:

Bug description:
  During boot, at dmesg timestamp 0, the kernel complains about fast TSC
  calibration failed. Then at around timestamp 7.9 the kernel complains
  about smpboot: CPU1: Not responding. After some more time, it will
  also say CPU2 and CPU3 aren't responding either. The computer proceeds
  to boot successfully, but only using 1 CPU core out of my quad core
  CPU (and as you might guess this makes it rather slow). According to
  /proc/cpuinfo my computer only recognizes a single core on my

  Here's the output of uname -a
  Linux <Hostname> 3.16.0-29-generic #39-Ubuntu SMP Mon Dec 15 22:27:29 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

  I'll attach dmesg and lspci outputs as well. I've also attached my
  /proc/cpuinfo file as it proves that my computer only recognizes one
  of my 4 cores.

  Also, this problem is absent on the 3.16.0-23 kernel.

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