diff --git a/src/acpi.c b/src/acpi.c
index 2c5f2ff90..f5c98b6e9 100644
--- a/src/acpi.c
+++ b/src/acpi.c
@@ -672,6 +672,7 @@ acpi_reg_write_common_regs(int size, uint16_t addr, uint8_t val, void *p)
             /* PMCNTRL - Power Management Control Register (IO) */
             if ((addr == 0x05) && (val & 0x20)) {
                 sus_typ = dev->suspend_types[(val >> 2) & 7];
+                acpi_log("ACPI suspend type %d flags %02X\n", (val >> 2) & 7, sus_typ);
 
                 if (sus_typ & SUS_POWER_OFF) {
                     /* Soft power off. */
@@ -1698,6 +1699,7 @@ acpi_init(const device_t *info)
             dev->suspend_types[1] = SUS_POWER_OFF;
             dev->suspend_types[2] = SUS_SUSPEND | SUS_NVR | SUS_RESET_CPU | SUS_RESET_PCI;
             dev->suspend_types[3] = SUS_SUSPEND;
+            dev->suspend_types[5] = SUS_POWER_OFF; /* undocumented, used for S4/S5 by ASUS P5A ACPI table */
             break;
 
         case VEN_VIA: