I have recently set up a Pi 4 (4GB) and a Hifiberry DAC2 HD. All is fine except for one strange issue - After playing quietly for a while, sometimes when I lightly touch the casing (e.g. to see if it's running hot) the volume increases to a loud level. It doesn't happen every time and it doesn't seem to be an earthing issue. I can reset the volume to the original level and the unit responds but why does touching the casing cause this effect? Any thoughts?
This is really strange and I don't think it has to do with touching the case. The volume is handled by software, there is no hardware control for this.
Check the output of "amixer" before and after this happens.
Hi
Thanks for the suggestion - the issue occurs ONLY when I touch the casing - and I mean just lightly touching it i.e just resting a hand on the top and applying no pressure at all. The trouble is that I'm a complete newbie - so how do I check the amixer?
Just log in via terminal or SSH and run the command amixer.
https://www.raspberrypi.org/documentation/remote-access/ssh/