diff --git a/files/p1/boot/grub/grub.cfg b/files/p1/boot/grub/grub.cfg
index 9bfeb93b..482854ca 100644
--- a/files/p1/boot/grub/grub.cfg
+++ b/files/p1/boot/grub/grub.cfg
@@ -60,7 +60,7 @@ function set_gfxpayload {
   fi
 }
 
-set ARC_CMDLINE="earlyprintk earlycon=uart8250,io,0x3f8,115200n8 console=ttyS0,115200n8 root=/dev/ram rootwait intremap=off net.ifnames=0 panic=5 split_lock_detect=off pcie_aspm=off intel_pstate=disable nox2apic nomodeset"
+set ARC_CMDLINE="earlyprintk earlycon=uart8250,io,0x3f8,115200n8 console=ttyS0,115200n8 root=/dev/ram rootwait intremap=off amd_iommu_intr=legacy net.ifnames=0 panic=5 split_lock_detect=off pcie_aspm=off intel_pstate=disable amd_pstate=disable nox2apic nomodeset"
 
 search --set=root --label "ARC3"
 if [ -s /zImage-dsm -a -s /initrd-dsm ]; then