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

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





--- Comment #65 from Francisco <flopezluro@gmail.com>  2011-08-19 22:16:52 ---
Thanks for the link dentament!, I followed step by step the instructions from
your first link to compile grub-efi 1.99 (using bzr), with architecture x86_64.
I put this new grub efi, with the following grub.cfg entry, into my /efi/grub
folder under the MacOs partition (using rEfit to boot).

======================================================
set debug=video
insmod efi_gop
menuentry "Linux (2 cores) - without bios dump)" {
  search --file --no-floppy --set=root /vmlinuz
  fakebios
  linux /vmlinuz root=/dev/sda4 video=efifb
  initrd /initrd.img
}
======================================================

My macbook 5,2 is booting with both kernels, acpi, and the 4Gb
of RAM. Suspend and restart work. I am using Ubuntu Natty, 
default shell, 3d effects, "32 bits" kernel 2.6.38-11 and nvidia drivers
(suggested by ubuntu - 270.41.06). I installed this Linux from the 
standard 32 bits Desktop CD. 

Screen brightness doesn't work now, but I remember some time ago that 
it took me a while to get it working but it can be done.

The bug that you mention about the CPU throttling is not happening
here, I can change the speed and it gets reflected in the
right place (based on what the bug explains):
$ sudo cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq 
2128000
$ sudo cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq 
2128000

As one can always ask for more..., this is the output of free:
             total       used       free     shared    buffers     cached
Mem:       2829980     929848    1900132          0      78112     351680
-/+ buffers/cache:     500056    2329924
So it's not 4Gb (as far as I can see) but I am sure they are somewhere down
there...

I am glad to help to anyone giving more info about my system.

Thanks!,
Francisco

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