I've moved this machine to another purpose, it now runs Windows 7. I'm too much of a Linux geek and I haven't figured out how to verify the Win7 machine is loaded with four cores, so I haven't ruled out the possibility of a hardware problem. In my previous testing, Windows XP showed four cores (before I reimaged it).
This problem still exists, in both Jaunty and Karmic. See my extensive troubleshooting in Karmic here:
https:/ /bugs.launchpad .net/ubuntu/ +source/ linux/+ bug/515270
I've moved this machine to another purpose, it now runs Windows 7. I'm too much of a Linux geek and I haven't figured out how to verify the Win7 machine is loaded with four cores, so I haven't ruled out the possibility of a hardware problem. In my previous testing, Windows XP showed four cores (before I reimaged it).