I've experienced a similar issue together with the iommu bug, but iommu=soft doesn't resolve it: https://bugs.launchpad.net/ubuntu/+source/linux-source-2.6.15/+bug/129260
I've experienced a similar issue together with the iommu bug, but iommu=soft doesn't resolve it: https:/ /bugs.launchpad .net/ubuntu/ +source/ linux-source- 2.6.15/ +bug/129260