I use the (great) AK5370 microphone for Skype, but it is not recognized by my archlinux i86_64.It also fails to recognize the mic on my Logitech Webcam (PTZ, which I do not use).Both are connected through the monitor's built-in hub, and both work through hubs an another system.  Both work on the same hardware with Ubuntu and Windows.Here they are on lsusb  ~]# lsusbBus 001 Device 002: ID 03f0:2524 Hewlett-Packard LP3065 30 Monitor HubBus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hubBus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hubBus 001 Device 003: ID 1532:001c Razer USA, Ltd RZ01-0036 Optical Gaming Mouse [Abyssus]Bus 001 Device 004: ID 04ca:002a Lite-On Technology Corp. Bus 001 Device 005: ID 0556:0001 Asahi Kasei Microsystems Co., Ltd AK5370 I/F A/D ConverterBus 001 Device 006: ID 046d:08cc Logitech, Inc. Mic (PTZ)But not on aplay's list-devices...]$ aplay --list-devices**** List of PLAYBACK Hardware Devices ****card 0: NVidia [HDA NVidia], device 0: ALC1200 Analog [ALC1200 Analog]  Subdevices: 0/1  Subdevice #0: subdevice #0card 0: NVidia [HDA NVidia], device 3: ALC1200 Digital [ALC1200 Digital]  Subdevices: 1/1  Subdevice #0: subdevice #0card 1: NVidia_1 [HDA NVidia], device 3: HDMI 0 [HDMI 0]  Subdevices: 1/1  Subdevice #0: subdevice #0card 1: NVidia_1 [HDA NVidia], device 7: HDMI 0 [HDMI 0]  Subdevices: 1/1  Subdevice #0: subdevice #0card 1: NVidia_1 [HDA NVidia], device 8: HDMI 0 [HDMI 0]  Subdevices: 1/1  Subdevice #0: subdevice #0card 1: NVidia_1 [HDA NVidia], device 9: HDMI 0 [HDMI 0]  Subdevices: 1/1  Subdevice #0: subdevice #0card 2: NVidia_2 [HDA NVidia], device 3: HDMI 0 [HDMI 0]  Subdevices: 1/1  Subdevice #0: subdevice #0card 2: NVidia_2 [HDA NVidia], device 7: HDMI 0 [HDMI 0]  Subdevices: 1/1  Subdevice #0: subdevice #0card 2: NVidia_2 [HDA NVidia], device 8: HDMI 0 [HDMI 0]  Subdevices: 1/1  Subdevice #0: subdevice #0card 2: NVidia_2 [HDA NVidia], device 9: HDMI 0 [HDMI 0]  Subdevices: 1/1note: card0 mobo card1&2 nvidia graphics (not used)PulseAudio Volume Control reports No input device available.No problem with these devices on other systems  Alas...pulseaudio 3.0-3pavucontrol 2.0-1skype 4.2.0.11-1alsa-lib 1.0.27.1-1Note: the webcam (UVC) with the min (PTZ) is recognized and works.Per Ignacio Vazquez-Abrams... (thanks)~]$ lsmod | grep '^snd' | column -tsnd_usb_audio          112569  0snd_usbmidi_lib        18931   1   snd_usb_audiosnd_rawmidi            18742   1   snd_usbmidi_libsnd_seq_device         5180    1   snd_rawmidisnd_hda_codec_hdmi     29298   8snd_hda_codec_realtek  30893   1snd_hda_intel          35816   4snd_hda_codec          145704  3   snd_hda_codec_realtek,snd_hda_codec_hdmi,snd_hda_intelsnd_hwdep              6364    2   snd_usb_audio,snd_hda_codecsnd_pcm                76860   4   snd_usb_audio,snd_hda_codec_hdmi,snd_hda_codec,snd_hda_intelsnd_page_alloc         7330    2   snd_pcm,snd_hda_intelsnd_timer              18687   1   snd_pcmsnd                    58893   19  snd_hda_codec_realtek,snd_usb_audio,snd_hwdep,snd_timer,snd_hda_codec_hdmi,snd_pcm,snd_rawmidi,snd_usbmidi_lib,snd_hda_codec,snd_hda_intel,snd_seq_deviceAnd in addition... ]# ls -l /dev/sndtotal 0drwxr-xr-x  2 root root      100 May 24 10:07 by-pathcrw-rw----+ 1 root audio 116,  8 May 24 10:07 controlC0crw-rw----+ 1 root audio 116, 17 May 24 10:07 controlC1crw-rw----+ 1 root audio 116, 26 May 24 10:07 controlC2crw-rw----+ 1 root audio 116,  7 May 24 10:07 hwC0D0crw-rw----+ 1 root audio 116, 16 May 24 10:07 hwC1D0crw-rw----+ 1 root audio 116, 15 May 24 10:07 hwC1D1crw-rw----+ 1 root audio 116, 14 May 24 10:07 hwC1D2crw-rw----+ 1 root audio 116, 13 May 24 10:07 hwC1D3crw-rw----+ 1 root audio 116, 25 May 24 10:07 hwC2D0crw-rw----+ 1 root audio 116, 24 May 24 10:07 hwC2D1crw-rw----+ 1 root audio 116, 23 May 24 10:07 hwC2D2crw-rw----+ 1 root audio 116, 22 May 24 10:07 hwC2D3crw-rw----+ 1 root audio 116,  6 May 24 10:07 pcmC0D0ccrw-rw----+ 1 root audio 116,  5 May 24 14:51 pcmC0D0pcrw-rw----+ 1 root audio 116,  2 May 24 10:07 pcmC0D2ccrw-rw----+ 1 root audio 116,  4 May 24 10:07 pcmC0D3ccrw-rw----+ 1 root audio 116,  3 May 24 10:07 pcmC0D3pcrw-rw----+ 1 root audio 116, 12 May 24 10:07 pcmC1D3pcrw-rw----+ 1 root audio 116, 11 May 24 10:07 pcmC1D7pcrw-rw----+ 1 root audio 116, 10 May 24 10:07 pcmC1D8pcrw-rw----+ 1 root audio 116,  9 May 24 10:07 pcmC1D9pcrw-rw----+ 1 root audio 116, 21 May 24 10:07 pcmC2D3pcrw-rw----+ 1 root audio 116, 20 May 24 10:07 pcmC2D7pcrw-rw----+ 1 root audio 116, 19 May 24 10:07 pcmC2D8pcrw-rw----+ 1 root audio 116, 18 May 24 10:07 pcmC2D9pcrw-rw----  1 root audio 116,  1 May 24 10:06 seqcrw-rw----+ 1 root audio 116, 33 May 24 10:07 timer
pulse-audio does not recognise my Logitech mic and my Webcam mic
alsa;pulseaudio;skype;usb audio