I've got an Alientek D8 with XMOS USB chip because its features almost perfectly fit my needs.
It's working fine with a Raspberry Pi 3 via USB, except hardware volume control. In fact, the first time I switched RuneAudio to hardware volume, it worked, but it stopped working after (don't remember exactly) rebooting or changing some other settings back and forth.
I can adjust the hardware volume using alsamixer and amixer, but not anymore with RuneAudio, it just has no effect.
Well, I can live with that, but nonetheless it would be nice, if it would work.
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[root@runeaudio ~]# lsusb | grep XMOS
Bus 001 Device 004: ID 20b1:302e XMOS Ltd
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[root@runeaudio ~]# amixer --card 1
Simple mixer control 'ALIENTEK Clock Selector',0
Capabilities: pvolume cvolume pswitch cswitch
Playback channels: Front Left - Front Right
Capture channels: Front Left - Front Right
Limits: Playback 0 - 127 Capture 0 - 127
Front Left: Playback 115 [91%] [-12.00dB] [on] Capture 115 [91%] [-12.00dB] [on]
Front Right: Playback 115 [91%] [-12.00dB] [on] Capture 115 [91%] [-12.00dB] [on]
Simple mixer control 'ALIENTEK Clock Selector',1
Capabilities: pvolume pvolume-joined cvolume cvolume-joined pswitch pswitch-joined cswitch cswitch-joined
Playback channels: Mono
Capture channels: Mono
Limits: Playback 0 - 127 Capture 0 - 127
Mono: Playback 127 [100%] [0.00dB] [on] Capture 127 [100%] [0.00dB] [on]
twinpeaks