Hello everyone, When i try to boot with IOMMU enable i got kernel panic saying "unable to mount root fs on unknown-block (8,18)" but kernel output show me my disk ... if i disable IOMMU in bios or add amd_iommu=off in grub i can boot without iommu. i think it's probleme between IOMMU and PCI raid card cause i found someone with the same probleme : http://ubuntuforums.org/showthread.php?t=2108012 my configuration is : kernel gentoo-3.6.11 AMD FX 8150 Gigabyte 990FX-ud5 dell perc5 + savvio (pcie card using megaraid sas driver) radeon HD 6950 do you have any clue about my probleme ? Thanks, Kazord -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html