diff --git a/src/mainboard/ibase/mb899/Kconfig b/src/mainboard/ibase/mb899/Kconfig
index fdfe541f47..05b0a09a0c 100644
--- a/src/mainboard/ibase/mb899/Kconfig
+++ b/src/mainboard/ibase/mb899/Kconfig
@@ -1,8 +1,5 @@
 if BOARD_IBASE_MB899
 
-config IGNORE_IASL_MISSING_DEPENDENCY
-	def_bool y
-
 config BOARD_SPECIFIC_OPTIONS
 	def_bool y
 	select CPU_INTEL_SOCKET_M
diff --git a/src/mainboard/ibase/mb899/acpi/superio.asl b/src/mainboard/ibase/mb899/acpi/superio.asl
index 488bf18a2c..1932eaba14 100644
--- a/src/mainboard/ibase/mb899/acpi/superio.asl
+++ b/src/mainboard/ibase/mb899/acpi/superio.asl
@@ -18,15 +18,6 @@ Device (SIO1)
 			Return (0x0f)
 		}
 
-		Method (_DIS, 0) { /* NOOP */ }
-
-		Name (_PRS, ResourceTemplate() {
-			StartDependentFn(0, 1) {
-				IO(Decode16, 0x3f8, 0x3f8, 0x8, 0x8)
-				IRQNoFlags() { 4 }
-			} EndDependentFn()
-		})
-
 		Method (_CRS, 0)
 		{
 			Return(ResourceTemplate() {
@@ -51,15 +42,6 @@ Device (SIO1)
 			Return (0x0f)
 		}
 
-		Method (_DIS, 0) { /* NOOP */ }
-
-		Name (_PRS, ResourceTemplate() {
-			StartDependentFn(0, 1) {
-				IO(Decode16, 0x2f8, 0x2f8, 0x8, 0x8)
-				IRQNoFlags() { 3 }
-			} EndDependentFn()
-		})
-
 		Method (_CRS, 0)
 		{
 			Return(ResourceTemplate() {