https://bugzilla.kernel.org/show_bug.cgi?id=43238





--- Comment #33 from Feng Tang <feng.t...@intel.com>  2012-07-17 13:51:05 ---
(In reply to comment #31)

> 
> First I mapped out the interrupt signals on the PCI slots using a multimeter. 
> Then I searched everywhere for a datasheet for the IT8892E, but no luck.  My
> main clue was that when I installed the ethernet card in slot 2, the kernel
> said the card was assigned to irq 17, but when I connected the ethernet cable,
> the kernel gave me an 'int 16: nobody cares' message.  At that point I was
> fairly certain it was a swizzle problem.  Then some educated guesses, along
> with some trial and error, and I came up with what I think is the correct
> routing.  The hardest part by far was trying to digest the contents of the
> dsdt.dsl file, although I think having the IT8892E datasheet would have saved 
> a
> fair amount of trouble.  That of course assumes that the datasheet wasn't the
> source of the errors in the first place.

Nice job!

So the wrong PRT table is the root cause. Further more, for those problemtic
Asus P8Z77xxx board, people could also try to modify the PRT table like what
you did to give all the IRQ numbers a drift of 1.

- Feng

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