Can you disable SMP in the kernel by appending the kernel line in GRUB

[Nigel Henry <cave.dnb@tiscali.fr>]

I've been trying to help someone on the list with acpi related shutdown 
problems, with no success up to now.

When I had shutdown problems with FC5 (fixed with using acpi=force), someone 
on the Fedora list suggested that it could be a problem with SMP kernels.

I Googled a bit the other day, and found stuff about recompiling the kernel, 
and disabling SMP in it, but is there a way to disable SMP by appending the 
kernel line in GRUB?

I read one comment that said:
To disable SMP at bootup, use,
noreplace-smp

Is that an appendment to the kernel line or what? I don't want to suggest 
something stupid for Mark to try.

Any comments, suggestions welcome.

Nigel.