USB MIDI device plug-in changes sound volume
From
Chris Ahlstrom@21:1/5 to
All on Thu Mar 27 09:21:20 2025
XPost: comp.os.linux.misc
Been happening lately on my Debian Sid mini-PC. It has a USB-to-headphone adapter [1] plugged in the back (USB 2), a USB 3 hub plugged into the front
via a USB-C to USB-B adapter, and another USB 3 hub plugged into that hub. There are various USB-MIDI controller plugged in, plus a (currently unused)
USB audio codec from Behringer.
So I take one device (Korg nanoKey2) and plug it in. The volume drops.
I turn it up via alsamixer. But it would be nice to figure out what is happening.
[1] This adapter is a Philips product bought at Target. In alsamixer,
it is called "iStore Audio". In pavucontrol, it's called "AB13X Headset Adapter Analog Stereo". Via lsusb it's called "Walmart AB13X Headset Adapter".
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