diff --git a/src/acpi/acpi.c b/src/acpi/acpi.c
index f8994eb..fb9a758 100644
--- a/src/acpi/acpi.c
+++ b/src/acpi/acpi.c
@@ -1689,6 +1689,10 @@
 	fadt->p_lvl2_lat = ACPI_FADT_C2_NOT_SUPPORTED;
 	fadt->p_lvl3_lat = ACPI_FADT_C3_NOT_SUPPORTED;
 
+	/* Use CPU _PTC instead to provide P_CNT details. */
+	fadt->duty_offset = 0;
+	fadt->duty_width = 0;
+
 	fadt->preferred_pm_profile = acpi_get_preferred_pm_profile();
 
 	if (CONFIG(USE_PC_CMOS_ALTCENTURY))