[Bug 59431] [snb efi gmux] imac 12,1 blank screen upon booting

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=59431

--- Comment #39 from Seth Forshee <seth.forshee at canonical.com> ---
(In reply to comment #37)
> I have no graphics setup or at least not that i am aware off.
> I get a ncurses based menu where i can choose the different kernels i have
> installed.

By "graphics" I just mean that grub can display something on the screen, which
seems to be the case. Typically on a Mac grub will use GOP for this, which is
the interface supported by efifb.

> Right now i cannot seem to get a console even with or without the
> gfxpayload=keep option on the 32bit kernel. When starting the same usb stick
> on a macbook air it works with both the 32bit kernel and the 64bit kernel.

There's only one graphics card in the airs. Part of your current problems seems
to be confusion over which card should be used.

> We don't use the default ubuntu grub install because we setup a small
> efiboot environment  using grub-mkimage.
> grub-mkimage -O x86_64-efi -o bootx64.efi  search_fs_uuid fat ext2 normal
> boot configfile linux

What I'm trying to figure out here is whether or not the patch I wrote is
actually needed. If it's a problem with how the kernel is being booted then
patching efifb probably isn't appropriate.

Please try booting a standard 64-bit Ubuntu image (either 12.10 or the 13.04
daily builds) and see if you experience any of the same problems. If not then
you've got a problem with your boot environment. I'm no grub expert, but your
list of modules is rather small. In particular I notice that there's a efi_gop
module that isn't included.

There's still obviously a problem with the graphics when you boot a 32-bit
kernel, but getting the kernel to identify the correct graphics device to use
is a prerequisite to fixing the other problem.

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