Apologies if this has been covered elsewhere. I am using the latest Antergos xfce with my Dell Latitude 5420 laptop. This model has dedicated volume up down and mute buttons to the side of the keyboard. These work in every version of Linux i have tried except this one. The only way i could adjust the volume was by adding a control button to the panel. That worked with volume up and down but once i tested the mute fiunction i was unable to unmute. Also i saw no settings option for audio or volume. Is there a workaround? Many thanks!