[arch-general] SOLVED Re: Realtek 8111/8168/8411 Blues - cannot get dhcpcd address (link UP)

[LoneVVolf]

On 21-08-15 04:58, David C. Rankin wrote:
> On 08/20/2015 09:34 PM, David C. Rankin wrote:
>>
>
> $#%#@%#$%... You have to enable IOMMU in the BIOS before the NIC will 
> work! I stumbled across this obscure little tidbit on the fedora forum:
>
> http://forums.fedoraforum.org/showthread.php?t=295616
>
> It triggers some nasty AMD I10 Page Faults/xhci messages during boot 
> of the 201508 install media, but the network comes right up, dhcp 
> works, no more lost packets, etc.
>
> I wonder if this is related to it corrupting my USB drives I plug into 
> it? Drives work the first time, sync, then umount. Next time you plug 
> them in, filesystem is gone?
>
> Oh well, at least I have a network now. I'll add it to the wiki.
>
>

Blame Gigabyte, the only reason to disable IOMMU is if you run a 32-bit OS .

On all x86_64 OSes running with IOMMU disabled will degrade graphics 
performance A LOT.
As you found , disabling IOMMU also affects other hardware badly.

TL;DR :
64-bit OS >>> ENABLE IOMMU


Some links :

https://en.wikipedia.org/wiki/IOMMU
http://developer.amd.com/community/blog/2008/09/01/iommu/

Lone_Wolf