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-rw-r--r--drivers/acpi/device_pm.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/acpi/device_pm.c b/drivers/acpi/device_pm.c
index f616b16c1f0b..4cb93d4f2ab6 100644
--- a/drivers/acpi/device_pm.c
+++ b/drivers/acpi/device_pm.c
@@ -166,6 +166,10 @@ int acpi_device_set_power(struct acpi_device *device, int state)
|| (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD))
return -EINVAL;
+ acpi_handle_debug(device->handle, "Power state change: %s -> %s\n",
+ acpi_power_state_string(device->power.state),
+ acpi_power_state_string(state));
+
/* Make sure this is a valid target state */
/* There is a special case for D0 addressed below. */