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Re: Bug#588208: grub-efi-ia32: breaks video of Mac Mini Core 2 Duo

From: Colin Watson
Subject: Re: Bug#588208: grub-efi-ia32: breaks video of Mac Mini Core 2 Duo
Date: Tue, 6 Jul 2010 09:54:38 +0100
User-agent: Mutt/1.5.18 (2008-05-17)

On Tue, Jul 06, 2010 at 08:37:51AM +0200, Tino Keitel wrote:
> Package: grub-efi-ia32
> Version: 1.98+20100705-1
> Severity: critical
> Justification: breaks unrelated software

For what it's worth, I'm likely to downgrade this for a while, until a
current version gets into testing; the version in testing has some
serious problems on all architectures right now that badly need to be

> after installing and using the current grub-efi-ia32, I got a grub menu
> once, which filled the whole screen in the native display resolution
> (1680x1050), instead of the 640x480 screen I used to get with older grub
> versions. Then I booted Linux.
> After a reboot, I don't get any video signal unless I boot a Linux kernel. I
> get no video signal in the EFI firmware, in the menu when I hold the cmd (or
> left alt) key during boot, in the grub menu, and in OS X.  So the computer
> is now damaged and unusable until a Linux kernel is loaded.  I have no idea
> what exactly caused this, but I'm using this Mac for more than a year now,
> and used another Mac mini Core Duo a few years before this, and never got
> such behaviour.  The only thing I did was to install and use grub-efi-ia32
> 1.98+20100705-1.  I used grub-efi-ia32 1.98 before.

Can anyone on grub-devel comment on this?  It seems remarkable that we
could be breaking video for future boots, and I wouldn't know where to
start looking.

(Full configuration details at

Colin Watson                                       address@hidden

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