I've found a solution to my problem : it was ACPI-related. Some ACPI options where disabled in the BIOS (due to problems with previous versions of ubuntu), I enabled them and the second core is now recognized.
Now, I'm wondering how ACPI options can interfere with SMP capabilties of the motherboard and why both cores where recognized on 9.04 even with these options disabled (something must have changed in ubuntu motherboard recognition I guess) but at least it works properly now. Of course I'm still available if more info is needed on this issue. -- Athlon X2 not recognized as dual core https://bugs.launchpad.net/bugs/437821 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
