I found a solution to this problem. Before, I needed to boot with options
noapic nolapic
which caused the machine to bring up one core only. Replacing the boot
options
as follows
noapic nolapic -- pci=assign-busses apicmaintimer idle=poll
reboot=cold,hard
fixed the problem on my machine. Since I
OK,
and thanks for your help. Indeed I seem to have some acpi problem, I get the
message:
bios bug detected acpi #0 not found
at startup. I have updated the bios when I bought the laptop (in order to get
Win XP running correctly) but the
problem persists. The bios update itself seemed to be
Public bug reported:
I have run Ubuntu 8.10 on my Packard Bell EasyNote MH-35 laptop without
problems. After upgrading to Ubuntu version 9.04, lap-top is slow and uses only
one core. The processor is Intel Core Duo T8100. I have to use noapic nolapic
boot options to get Ubuntu booting (also in
