drm/nouveau/therm: automatic mode by default

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/core/subdev/therm/base.c

@@ -355,7 +355,7 @@ nouveau_therm_preinit(struct nouveau_therm *therm)
 	nouveau_therm_ic_ctor(therm);
 	nouveau_therm_fan_ctor(therm);
 
-	nouveau_therm_fan_mode(therm, NOUVEAU_THERM_CTRL_NONE);
+	nouveau_therm_fan_mode(therm, NOUVEAU_THERM_CTRL_AUTO);
 	nouveau_therm_sensor_preinit(therm);
 	return 0;
 }