Re: [Mactel-linux-users] MacBook Pro 8.2

[mike d. <fl...@po...>]

Johannes Graumann said:
> > grub-efi is not yet mature enough to with play with.
> Grrr ...

Fortunately, that's not true. I got a late 2011 MBP8,2 a few days ago,
and I'm booting in pure EFI mode using the Integrated Graphics Device
(IGD). Some issues remain though, as the radeon KMS is on by default
during the first part of the boot sequence, resulting in a black screen
or a garbled output depending upon the grub options you choose (it's a
problem for me since I need to type the passphrase for my / partition).

There's a patch though, which I haven't managed to get working yet, see
https://bugs.freedesktop.org/show_bug.cgi?id=26891 (any help appreciatd)

There's also a patch floating around to enable graphic switching through apple_gmux & vga_swicheroo, but I'm not there yet.

Anyways, to get the intel working, you need to apply the i915 lvds dual
channer patch (I applied it to Linux 3.1.1 from sid):
https://github.com/fooblahblah/linux-mainline-efi-lvds/blob/master/lvds_dual_channel.patch

You then need to add the following to grub.cfg in your menuentry:

	# Switch gmux to IGD
	        outb 0x728 1
	        outb 0x710 2
	        outb 0x740 2
	# Powers down ATI
	        outb 0x750 0

...and the following as kernel options on the "linux" line:

	i915.lvds_channels=2 i915.modeset=1 i915.lvds_use_ssc=0

-- 
mike dentifrice <fl...@po...>