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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https://bugs.launchpad.net/bugs/1411884
Title:
not all CPU cores loaded during boot
Status in linux package in Ubuntu:
Incomplete
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
computer.
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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