diff --git a/config/coreboot-t420.config b/config/coreboot-t420.config
index dfce0080..82095d22 100644
--- a/config/coreboot-t420.config
+++ b/config/coreboot-t420.config
@@ -20,6 +20,6 @@ CONFIG_CONSOLE_CBMEM_BUFFER_SIZE=0x80000
 CONFIG_DEFAULT_CONSOLE_LOGLEVEL_5=y
 CONFIG_PAYLOAD_LINUX=y
 CONFIG_PAYLOAD_FILE="../../build/t420/bzImage"
-CONFIG_LINUX_COMMAND_LINE="quiet"
+CONFIG_LINUX_COMMAND_LINE="intel_iommu=igfx_off quiet loglevel=3"
 CONFIG_LINUX_INITRD="../../build/t420/initrd.cpio.xz"
 CONFIG_DEBUG_SMM_RELOCATION=y