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Ubuntu 12.10 alpha 2 works perfectly on my new 11" 2012 Macbook Air, but only when I boot with the "nointremap" option. Supposedly this is not good to use as a permanent solution. What exactly does this option do, and why is it "bad"?

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From the kernel documentation:

nointremap  [X86-64, Intel-IOMMU] Do not enable interrupt remapping.
            [Deprecated - use intremap=off]

For information about IOMMU, have a look at the Wikipedia page.

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Yeah, I know it turns off interrupt remapping. But why is interrupt remapping normally needed and what is the problem with running without it? – Zifre Jul 20 '12 at 23:18
@Zifre Good question. I too would like to know. – trusktr Mar 31 '13 at 6:48
@UlrichDangel What are the implications of using nointremap? – trusktr Mar 31 '13 at 7:05

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