diff --git a/src/mainboard/google/samus/acpi/mainboard.asl b/src/mainboard/google/samus/acpi/mainboard.asl
index 4d905f5c90..918e56580b 100644
--- a/src/mainboard/google/samus/acpi/mainboard.asl
+++ b/src/mainboard/google/samus/acpi/mainboard.asl
@@ -170,6 +170,7 @@ Scope (\_SB.PCI0.I2C0)
 		Name (WAKE, 45) /* DSP_INT (use as codec wake) */
 
 		Name (MB1, 1)   /* MICBIAS1 = 2.970V */
+		Name (DACR, 1)  /* Use codec internal 1.8V as DACREF source */
 		Name (DCLK, 0)  /* RT5677_DMIC_CLK1 */
 		Name (PCLK, 1)  /* RT5677_PDM_CLK_DIV2 (~3MHz) */
 		Name (IN1, 1)   /* IN1 differential */
@@ -187,6 +188,7 @@ Scope (\_SB.PCI0.I2C0)
 			ToUUID ("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
 			Package () {
 				Package () { "realtek,micbias1", 1 },
+				Package () { "realtek,internal-dacref-en", 1 },
 				Package () { "realtek,in1-differential", 1 },
 				Package () { "realtek,in2-differential", 0 },
 				Package () { "realtek,lout1-differential", 1 },