Bug#988876: grub-efi-amd64: outb command no longer works

[Marco Kühnel]

UEFI Secure Boot is disabled. The machine is a Macbook8,3 converted to a pure 
Linux box, however. So, the EFI firmware might be damaged. Thank you for the 
clarification.

In order to disable the (not properly supported) discrete graphics card, I 
need to execute the mentioned outb commands. Indeed, I edited /etc/grub.d/
10_linux in order to do this. 
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