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Re: Grub2 and Efi (MacBook 5,1)

From: Stefan Bienert
Subject: Re: Grub2 and Efi (MacBook 5,1)
Date: Tue, 22 Sep 2009 19:54:07 +0200
User-agent: Thunderbird (X11/20090912)

Felix Zielcke wrote:
> Am Dienstag, den 22.09.2009, 19:34 +0200 schrieb Stefan Bienert:
>> Michal Suchanek wrote:
>>> Unfortunately. grub refuses to pass on vga=ask for me.
> vga=ask only works with the old linux loader, linux16.
> But that isn't avaible in EFI because in EFI you can't load the kernel
> with its 16 bit entry point.
>>> I am not sure what vbios is supposed to do for you. There is also the
>>> question when the graphics card is switched to vga. Normally the
>>> kernel expects the card to be in vga state so it should be probably
>>> done by grub.
>>, do we have any more dense tips, here? Sounds like the two of us
>> are somehow lost ;-) I tried playing around with video=... without any
>> success. Where can I find some docu on grub2 video and vga options?

> you're searching in the wrong place. video and vga are options for the
> Linux kernel.
> Though vga= is parsed by grub, because the kernel excepts it's value in
> a different format then in the standard commandline.
> Note that `set gfxpayload=1024x768x16' (or whatever resolution/depth you
> want) is now the prefered way with the new Linux loader.

AHA! Well, confusion rises ...

So, my grub-legacy configuration uses none of video or vga
there a way to test if efifb is working with my kernel, anyway? I think
a hint where to search should be enough.

Just to get this right: If I use any framebuffer beside efifb, I need to
load a video bios?

And last, but not least: What does "Linux loader" mean?



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