From: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> Add an acpi_handle_debug() statement to acpi_device_set_power() to allow ACPI device power state changes to be tracked. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> --- drivers/acpi/device_pm.c | 4 ++++ 1 file changed, 4 insertions(+) Index: linux-pm/drivers/acpi/device_pm.c =================================================================== --- linux-pm.orig/drivers/acpi/device_pm.c +++ linux-pm/drivers/acpi/device_pm.c @@ -166,6 +166,10 @@ int acpi_device_set_power(struct acpi_de || (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. */
