HelenOS sources

ddf_log_warning   359 uspace/drv/audio/hdaudio/pcm_iface.c 			ddf_log_warning("No one listening for event %u", event);
ddf_log_warning   161 uspace/drv/audio/sb16/dsp.c 		ddf_log_warning("No one listening for event %u", event);
ddf_log_warning   280 uspace/drv/audio/sb16/dsp.c 		ddf_log_warning("Interrupt while DSP not active (%s)",
ddf_log_warning   171 uspace/drv/audio/sb16/main.c 		ddf_log_warning("Failed to init mpu driver: %s.",
HelenOS homepage, sources at GitHub