Comment 20 for bug 1721345

No, using stock pulseuadio configuration or the one I had patched will not work. I had to increase the headphone volume with alsamixer manually. Before your patch, I could change the volume by keeping master at 100% and vary the PCM channel. Thr PCM channel seems to alter the amplifier attached to the main speakers. The amplifier attached to the subwoofer has a separate channel named bass speaker in alsamixer. My pulseuadio config patch with a stock kernel allows changing volume from the GUI and hotkeys without any fuss.