[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 #72 from morten vermund <mortenvermund at gmail.com> ---
(In reply to Francisco from comment #63)
> Hi, I've been following this bug for a while since I've a macbook 5,2. I've
> been able to use linux (ubuntu) with refit+grub-efi+nvidia driver for a
> while. Last week I reinstalled everything, Snow Leopard, Win7 and Ubuntu
> natty, everything works PERFECT using the same approach.
> 
> Today, I've upgraded the RAM, from 2 to 4 Gigs (removed 2x1Gb and put
> 2x2Gb). Linux doesn't boot anymore with refit+grub-efi, only using maxcpus=1
> or acpi=off (still with Nvidia). The ram is OK, passes memtest86+, and win
> and snow leopard work without any problem. If I remove ANY one of the memory
> chips (1x2Gb 800Mhz) linux can boot again with grub-efi.
> 
> I guess this is probably a problem of grub-efi, but as it is related I
> wanted to post it here, sorry if it's the wrong place.
> 
> Here you can see the boot error from grub-efi when booting with 4Gb.
> http://www.billigalaan.se
> 
> Please let me know if you want me to test anything in particular.
> I have Natty with Nvidia 270.41.06, with uname -r: 2.6.38-10-generic
> 
> Sadly now I have to give up one CORE for 2gb of extra RAM :(
> 
> Thanks!
> Francisco

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