I've the same problem with a Maxell MXL-1191-R USB wireless headphone.
The volume control buttons on this headphone (they are built into the
right speaker's case) work out of the box, but controls the device last
selected in the Output tab of the Sound Preferences dialog. So the
problem is with the selection of the device to control.
I can reproduce this problem, so you can contact me anytime if you have
a proposed fix to test or at least some pointers where can I look for
the issue in my system. I'm a developer, so I can even fix it if you
provide me with some insight into this subsystem.
Thank you in advance.
** Changed in: gnome-settings-daemon (Ubuntu)
Status: Triaged => Confirmed
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volume keys on different devices can't set different volume sliders
https://bugs.launchpad.net/bugs/315162
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