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

[Isaac Dupree]

On 07/06/10 04:54, Colin Watson wrote:
> 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
> http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=588208.)

I'm tempted to ask (but you probably shouldn't try it!*), what if you 
clear the BIOS/EFI state (NVRAM) in case it's been corrupted somehow 
relevant --
hold Command-Option-P-R while booting
http://support.apple.com/kb/ht1533
*WARNING! If it doesn't fix the problem, then you obviously still won't 
be able to see... and, however it was configured such that GRUB would 
automatically be booted is likely to be broken now, leading to 
unhappiness :-(

(A safer way to investigate this thought would be to dump the contents 
of your NVRAM and upload it and compare it to what the default state 
looks like, if anyone knows how to do that?)

Does booting from a Linux LiveCD give you graphics?  (via grub or refit 
or holding 'c' when you boot) -- both as some sort of failsafe, and it 
*might* give us a bit of information. (disclaimer: I don't develop grub2 
so far, I just use it [on my Macbook, using grub2 BIOS based since I 
haven't gotten grub2 EFI to boot Linux very well yet], and read the 
mailing-list)

-Isaac