Comment 25 for bug 817017

Yes,

I originally used refit as well. It has one problem. It will not detect
grub-efi as Linux, it will only show a diamond shaped symbol indicating it
as a EFI bootloader.
I currently use refind (http://www.rodsbooks.com/refind/), it is great! :D
You should check it out.
(Sometimes Grub might set itself to be run before refind/refit. In this
case, you can boot in OSX and "bless" it (just as if you were installing
refit again).

Pedro Nariyoshi

On Wed, Jan 30, 2013 at 1:08 PM, analogue <email address hidden> wrote:

> Pedro,
>
> I'm using refit (http://refit.sourceforge.net/). Any idea if this works
> with grub-efi?
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/817017
>
> Title:
> AHCI mode not restored during sleep-wakeup cycle
>
> Status in Mactel Support:
> In Progress
>
> Bug description:
> The SATA controller operates by default in IDE mode and there is no
> known EFI setting to override this behavior. Fortunately, it can be put
> into AHCI mode before the Linux kernel is booted (e.g. by Grub2 *) ).
> SSD disks perform much better in AHCI mode. On my laptop, both Intel SSD
> 320 and a Cruzial RealSSD C300 performed great in the beginning, but system
> responsiveness degraded soon to a point where system load was around 6 to 7
> during updates (apt-get dist-upgrade) and second long freezes during normal
> work (e.g. browsing, responding to emails, heck - even when using vim in a
> terminal! ...).
>
> Unfortunately there is a drawback when putting the SATA controller into
> AHCI mode: AHCI is not restored during sleep-wakeup cycles and thus the
> system crashes badly after wakeup, because it suddently finds only an IDE
> controller.
> We need to patch (e.g. the SATA driver?) and check which mode the
> controller had been in, before the laptop was sent to sleep and restore the
> previous mode.
>
> *) How to put the SATA controller into AHCI mode [1]:
> MBP 6,2 (or any other 5 series/3400 series chipset based MBP)
> put this line before 'set root=...':
> setpci -d 8086:3b28 90.b=60
> (that command sets bit 5 and 6 on register 0x90 -- lookup Intel document
> number 322169 for details)
>
> [1] http://en.gentoo-wiki.com/wiki/Apple_Macbook_Pro
>
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