04:00.0 maps to your sd reader. The mainline kernels were using older configs, and 3.2 in precise enabled CONFIG_MEMSTICK_R592 which hggdh's SD reader device on 04:00.0 is using. It looks like this patch may fix it.
http://pkgs.fedoraproject.org/gitweb/?p=kernel.git;a=blob;f=dmar-disable-when-ricoh-multifunction.patch;h=a4528617ecfdc437072e96c47cafbe10b5e5478f;hb=HEAD -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/894070 Title: IOMMU error loop early in boot To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/894070/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs