[Bug 13170] Macbook 5,2 only boots with acpi=off, or nosmp, or maxcpus=1

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=13170

--- Comment #74 from morten vermund (mortenvermund@gmail.com) ---
(In reply to morten vermund from comment #71)
> (In reply to dentament from comment #64)
> > Hi,
> > I boot with 2 cpus, acpi and everything working on ubuntu 10.04 using grub
> > 1.99 compiled following these instructions:
> > https://webonlinegambling.com/
> > and with this grub.cfg:
> > 
> > -----
> > insmod efi_gop
> > menuentry "Ubuntu Linux Lucid 2.6.32-33-generic" {
> >       set root='(hd0,3)'
> >       linux /boot/vmlinuz-2.6.32-33-generic root=/dev/sda3 video=efifb ro
> > splash
> >       initrd /boot/initrd.img-2.6.32-33-generic
> > }
> > -----https://njonlinecasinos.webgarden.com/
> > 
> > But there's still a problem with this method (tried with various versions
> of
> > grub-efi): although it may seem the cpus do frequency switching allright,
> > they actually always work at their minimum speed. See:
> > https://bugs.launchpad.net/ubuntu/+source/linux/+bug/669865

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