On Fri, 18 Jun 2010, Jerry Geis wrote: > Peter Kjellstrom wrote: >> On Friday 18 June 2010, Jerry Geis wrote: >> >>> I just installed centos 5.5 x86_64 on a new HP laptop. >>> It has the core i5 processor. >>> >>> only 1 cpu is detected should be 2. >>> > dmesg is : > > Linux version 2.6.18-194.3.1.el5 (mockbuild at builder10.centos.org) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-48)) #1 SMP Thu May 13 13:08:30 EDT 2010 > Command line: ro root=LABEL=/ rhgb quiet noapic acpi=off apci=off I'll admit that I've never had to resort to "acpi=off", but my multi-core system all boot with a dmesg that says Using ACPI (MADT) for SMP configuration information In particular, your system reported > SMP: Allowing 0 CPUs, 0 hotplug CPUs That doesn't look right. It should report that it allows multiple CPUs. Can you boot this system without turning off acpi? -- Paul Heinlein <> heinlein at madboa.com <> http://www.madboa.com/