Originally Posted by Deanjo
OK this looks like a BIOS issue more then anything. I finally pestered Asus enough that they fixed their IOMMU in the BIOS and now it boots fine to the desktop with IOMMU enabled. The 11.02 Bios releases for the Sabertooth 990FX and the M5A97 EVO fixed this issue.
Hrm... it appears they didn't fix it in 1102 for the M5A99X EVO board. I'm still getting XIDs and then the kernel detects CPU soft lockups.
Are you enabling the IOMMU option only or the IOMMU and the 64 MB window?
Can you provide any ASUS CaseIDs with the fix that I can reference?