From mboxrd@z Thu Jan  1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 13170] Macbook 5,2 only boots with acpi=off, or nosmp, or
	maxcpus=1
Date: Fri, 19 Aug 2011 11:08:26 GMT
Message-ID: <201108191108.p7JB8Qsg024126@demeter2.kernel.org>
References: <bug-13170-2300@https.bugzilla.kernel.org/>
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https://bugzilla.kernel.org/show_bug.cgi?id=13170





--- Comment #64 from dentament <l_done@tiscali.it>  2011-08-19 11:08:25 ---
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
}
-----

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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