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

[bugzilla-daemon at bugzilla.kernel.org]

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

--- Comment #71 from morten vermund <mortenvermund at gmail.com> ---
(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://help.ubuntu.com/community/UEFIBooting
> 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
> }
> -----http://www.hlrevision.dk
> 
> 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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