Re: intel_iommu=on => No root device found

[Gordon Messmer <yinyang@xxxxxxxxx>]

On 01/29/2013 01:16 PM, Nils Caspar wrote:
> Everything works so far, but when I add intel_iommu=on to the kernel
> line of my grub.conf, Dracut gives my a kernel panic while booting. I
> added "rdshell" to the command line and extracted the boot messages
> via dmesg (http://nilscaspar.ch/centos-dmesg.log).

Similar behavior has been diagnosed as a hardware bug:
https://bugzilla.redhat.com/show_bug.cgi?id=605888

Boot the system with the IOMMU off and find out what PCI device is at 
05:01.0 using lspci.  Assuming that it's not critical, try disabling or 
removing that component.
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