Finally got it to work by trial and error. If I boot the machine with 'noapic' and remove all splash and vga= options I systematically get all cores recognized. Seems like 'noapic' is the real key here. Without it, booting can bring up 1, 2 or 4 cores in a seemingly random fashion.
-- Usually misses 2nd processor https://bugs.launchpad.net/bugs/97554 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
