> I'm having a rather similar problem with my Dual Opteron / SCSI machine. At least in my case 2.6.14/15 seem to have changed something that breaks the PCI scan on ACPI machines. As far as I could see (by adding printks) to the kernel, the PCI scan doesn't see most of the bus bridges and devices on my machine. > The following bug report helped me with kernel upgrade issues on V20z (dual Opteron) boxes. Though the bug itself is limited to LSI SCSI devices, maybe you can find something else on bugzilla which references PCI & ACPI kernel upgrade issues: https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=169610
