Public bug reported:
This has worked with this particular kernel, and previous kernels, but
lately my quad-core system has only been bringing up one CPU/core. I've
attached debugging.txt, which contains the output of uname -a, cat
/proc/cpuinfo, and dmesg. I figure there's about a 15% chance that all
four cores will be brought up when I reboot, but I haven't been able to
figure out how to force it to bring up all cores. Downgrading to
previous kernels doesn't work. And booting into WinXP definitely shows
all four cores, so I doubt it's a problem with the hardware (but I may
be wrong about this).
ProblemType: Bug
Architecture: i386
DistroRelease: Ubuntu 8.10
NonfreeKernelModules: nvidia
Package: linux-image-2.6.27-11-generic 2.6.27-11.27
ProcCmdLine: root=UUID=5b026cc0-09be-4255-8023-54c95619ca42 ro cpus=4 splash
ProcEnviron:
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.27-11.27-generic
SourcePackage: linux
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: apport-bug
--
SMP kernel only brings up one CPU/core
https://bugs.launchpad.net/bugs/326794
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