My system is an intel chip-set-based laptop with debian 9.1
I ended up ordering this, but neither headphone, nor microphone work, even though the adapter is recognized in what I believe are all the relevant places as soon as it is plugged in:
The USB adapter is identified as "C-Media USB Headphone Set" in
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nick@oldlaptop:~$ usb-devices
T: Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=480 MxCh= 2
D: Ver= 2.00 Cls=09(hub ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1
P: Vendor=1d6b ProdID=0002 Rev=04.09
S: Manufacturer=Linux 4.9.0-3-amd64 ehci_hcd
S: Product=EHCI Host Controller
S: SerialNumber=0000:00:1a.0
C: #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr=0mA
I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub
T: Bus=01 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 2 Spd=480 MxCh= 6
D: Ver= 2.00 Cls=09(hub ) Sub=00 Prot=01 MxPS=64 #Cfgs= 1
P: Vendor=8087 ProdID=8008 Rev=00.04
C: #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr=0mA
I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub
T: Bus=02 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=480 MxCh= 2
D: Ver= 2.00 Cls=09(hub ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1
P: Vendor=1d6b ProdID=0002 Rev=04.09
S: Manufacturer=Linux 4.9.0-3-amd64 ehci_hcd
S: Product=EHCI Host Controller
S: SerialNumber=0000:00:1d.0
C: #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr=0mA
I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub
T: Bus=02 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 2 Spd=480 MxCh= 8
D: Ver= 2.00 Cls=09(hub ) Sub=00 Prot=01 MxPS=64 #Cfgs= 1
P: Vendor=8087 ProdID=8000 Rev=00.04
C: #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr=0mA
I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub
T: Bus=03 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=480 MxCh=14
D: Ver= 2.00 Cls=09(hub ) Sub=00 Prot=01 MxPS=64 #Cfgs= 1
P: Vendor=1d6b ProdID=0002 Rev=04.09
S: Manufacturer=Linux 4.9.0-3-amd64 xhci-hcd
S: Product=xHCI Host Controller
S: SerialNumber=0000:00:14.0
C: #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr=0mA
I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub
T: Bus=03 Lev=01 Prnt=01 Port=01 Cnt=01 Dev#= 2 Spd=12 MxCh= 0
D: Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1
P: Vendor=248a ProdID=8366 Rev=01.00
S: Manufacturer=Telink
S: Product=Wireless Receiver
C: #Ifs= 1 Cfg#= 1 Atr=a0 MxPwr=50mA
I: If#= 0 Alt= 0 #EPs= 1 Cls=03(HID ) Sub=01 Prot=02 Driver=usbhid
T: Bus=03 Lev=01 Prnt=01 Port=05 Cnt=02 Dev#= 18 Spd=12 MxCh= 0
D: Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1
P: Vendor=0d8c ProdID=000c Rev=01.00
S: Product=C-Media USB Headphone Set
C: #Ifs= 4 Cfg#= 1 Atr=a0 MxPwr=100mA
I: If#= 0 Alt= 0 #EPs= 0 Cls=01(audio) Sub=01 Prot=00 Driver=snd-usb-audio
I: If#= 1 Alt= 0 #EPs= 0 Cls=01(audio) Sub=02 Prot=00 Driver=snd-usb-audio
I: If#= 2 Alt= 0 #EPs= 0 Cls=01(audio) Sub=02 Prot=00 Driver=snd-usb-audio
I: If#= 3 Alt= 0 #EPs= 1 Cls=03(HID ) Sub=00 Prot=00 Driver=usbhid
T: Bus=03 Lev=01 Prnt=01 Port=06 Cnt=03 Dev#= 3 Spd=12 MxCh= 0
D: Ver= 2.00 Cls=e0(wlcon) Sub=01 Prot=01 MxPS=64 #Cfgs= 1
P: Vendor=8087 ProdID=07da Rev=78.69
C: #Ifs= 2 Cfg#= 1 Atr=e0 MxPwr=0mA
I: If#= 0 Alt= 0 #EPs= 3 Cls=e0(wlcon) Sub=01 Prot=01 Driver=btusb
I: If#= 1 Alt= 0 #EPs= 2 Cls=e0(wlcon) Sub=01 Prot=01 Driver=btusb
T: Bus=03 Lev=01 Prnt=01 Port=07 Cnt=04 Dev#= 4 Spd=480 MxCh= 0
D: Ver= 2.00 Cls=ef(misc ) Sub=02 Prot=01 MxPS=64 #Cfgs= 1
P: Vendor=5986 ProdID=0400 Rev=06.10
S: Manufacturer=Bison
S: Product=BisonCam, NB Pro
C: #Ifs= 2 Cfg#= 1 Atr=80 MxPwr=500mA
I: If#= 0 Alt= 0 #EPs= 1 Cls=0e(video) Sub=01 Prot=00 Driver=uvcvideo
I: If#= 1 Alt= 0 #EPs= 0 Cls=0e(video) Sub=02 Prot=00 Driver=uvcvideo
T: Bus=04 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=5000 MxCh= 4
D: Ver= 3.00 Cls=09(hub ) Sub=00 Prot=03 MxPS= 9 #Cfgs= 1
P: Vendor=1d6b ProdID=0003 Rev=04.09
S: Manufacturer=Linux 4.9.0-3-amd64 xhci-hcd
S: Product=xHCI Host Controller
S: SerialNumber=0000:00:14.0
C: #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr=0mA
I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub
nick@oldlaptop:~$
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nick@oldlaptop:~$ lsusb
Bus 002 Device 002: ID 8087:8000 Intel Corp.
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 8087:8008 Intel Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 004: ID 5986:0400 Acer, Inc
Bus 003 Device 003: ID 8087:07da Intel Corp.
Bus 003 Device 018: ID 0d8c:000c C-Media Electronics, Inc. Audio Adapter
Bus 003 Device 002: ID 248a:8366
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
nick@oldlaptop:~$
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nick@oldlaptop:~$ cat /proc/asound/cards
0 [HDMI ]: HDA-Intel - HDA Intel HDMI
HDA Intel HDMI at 0xf7e14000 irq 35
1 [PCH ]: HDA-Intel - HDA Intel PCH
HDA Intel PCH at 0xf7e10000 irq 34
2 [Set ]: USB-Audio - C-Media USB Headphone Set
C-Media USB Headphone Set at usb-0000:00:14.0-6, full speed
nick@oldlaptop:~$
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nick@oldlaptop:~$ ls -al /dev/snd
total 0
drwxr-xr-x 4 root root 380 Sep 17 18:24 .
drwxr-xr-x 19 root root 3320 Sep 17 18:24 ..
drwxr-xr-x 2 root root 60 Sep 17 18:24 by-id
drwxr-xr-x 2 root root 100 Sep 17 18:24 by-path
crw-rw----+ 1 root audio 116, 7 Sep 17 12:04 controlC0
crw-rw----+ 1 root audio 116, 2 Sep 17 12:04 controlC1
crw-rw----+ 1 root audio 116, 12 Sep 17 18:24 controlC2
crw-rw----+ 1 root audio 116, 11 Sep 17 12:04 hwC0D0
crw-rw----+ 1 root audio 116, 6 Sep 17 12:04 hwC1D0
crw-rw----+ 1 root audio 116, 8 Sep 17 12:05 pcmC0D3p
crw-rw----+ 1 root audio 116, 9 Sep 17 12:05 pcmC0D7p
crw-rw----+ 1 root audio 116, 10 Sep 17 12:05 pcmC0D8p
crw-rw----+ 1 root audio 116, 4 Sep 17 18:05 pcmC1D0c
crw-rw----+ 1 root audio 116, 3 Sep 17 16:32 pcmC1D0p
crw-rw----+ 1 root audio 116, 5 Sep 17 12:04 pcmC1D2p
crw-rw----+ 1 root audio 116, 14 Sep 17 19:13 pcmC2D0c
crw-rw----+ 1 root audio 116, 13 Sep 17 18:24 pcmC2D0p
crw-rw----+ 1 root audio 116, 1 Sep 17 12:04 seq
crw-rw----+ 1 root audio 116, 33 Sep 17 12:04 timer
nick@oldlaptop:~$
But in that case, which one, and how? Or perhaps this is a clue that this particular device is not supported and I should return it for another? But in that case can someone please post the name of one that is sure to work in debian?
I would like to attach images of the two sound output and input device configuration tabs from the mate desktop controller, which show that the non-built-in devices have been properly selected (these are the ones that pop up automatically in the list of devices as soon as the USB adapter is inserted, and so should be the correct choices), but the "upload attachment" option fails when I try, so my verbal descriptions will just have to do for now (as will my verbal assurance that volume is not muted in my tests).
Thanks in advance