O comando lspci não parece encontrar dispositivos de áudio.
~$ lspci
00:00.0 Host bridge: Intel Corporation Atom Processor Z36xxx/Z37xxx Series SoC Transaction Register (rev 0f)
00:02.0 VGA compatible controller: Intel Corporation Atom Processor Z36xxx/Z37xxx Series Graphics & Display (rev 0f)
00:14.0 USB controller: Intel Corporation Atom Processor Z36xxx/Z37xxx Series USB xHCI (rev 0f)
00:1a.0 Encryption controller: Intel Corporation Atom Processor Z36xxx/Z37xxx Series Trusted Execution Engine (rev 0f)
00:1f.0 ISA bridge: Intel Corporation Atom Processor Z36xxx/Z37xxx Series Power Control Unit (rev 0f)
e alsamixer é 100 .
Estas são as informações do driver de áudio que recebi do pacote do driver do Windows:
<DriverName>Realtek I2S Audio Codec</DriverName><ClassName>MEDIA</ClassName><Inf>oem20.inf</Inf><HardwareIDs><HID>ACPI\VEN_10EC&DEV_5640 ACPIEC5640
*10EC5640 ACPIEC5640 10EC5640</HID></HardwareIDs><OS>82</OS><FileName>Realtek I2S Audio Codec.zip</FileName></item><item><DriverName>Intel SST Audio Device (WDM)</DriverName><ClassName>MEDIA</ClassName><Inf>oem10.inf</Inf><HardwareIDs><HID>ACPI\VEN_8086&DEV_0F28&SUBSYS_80867270 ACPI860F28
*80860F28 ACPI860F28 80860F28</HID></HardwareIDs><OS>82</OS><FileName>Intel SST Audio Device (WDM).zip</FileName></item><item>
Após este post, aqui está uma saída relevante:
~$ lsmod | grep snd
snd_soc_sst_byt_rt5640_mach 12524 0
snd_soc_rt5640 82914 0
snd_soc_rl6231 12442 1 snd_soc_rt5640
snd_soc_core 147300 2 snd_soc_rt5640,snd_soc_sst_byt_rt5640_mach
snd_compress 17197 1 snd_soc_core
snd_pcm 88662 2 snd_soc_rt5640,snd_soc_core
snd_timer 26614 1 snd_pcm
snd 65244 4 snd_soc_core,snd_timer,snd_pcm,snd_compress
soundcore 13026 1 snd
regmap_i2c 12783 1 snd_soc_rt5640
snd_soc_sst_acpi 12559 0
i2c_core 46012 8 drm,i915,snd_soc_rt5640,i2c_hid,i2c_designware_platform,regmap_i2c,drm_kms_helper,i2c_algo_bit
~$ cat /proc/asound/cards
--- no soundcards ---
~$ aplay -L
default
Playback/recording through the PulseAudio sound server
null
Discard all samples (playback) or generate zero samples (capture)
pulse
PulseAudio Sound Server
~$ groups |grep audio
lm cdrom floppy audio dip video plugdev netdev scanner bluetooth lpadmin
dmesg output existem alguns posts na internet sobre a questão, parece que ninguém encontrou uma boa resposta ...
[ 3.647103] byt-rt5640 byt-rt5640: ASoC: CPU DAI baytrail-pcm-audio not registered
548 [ 3.647132] platform byt-rt5640: Driver byt-rt5640 requests probe deferral
549 [ 3.649476] usb 1-1.1: New USB device found, idVendor=1017, idProduct=1006
550 [ 3.649484] usb 1-1.1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
551 [ 3.649689] usb 1-1.1: ep 0x81 - rounding interval to 64 microframes, ep desc says 80 microframes
552 [ 3.649701] usb 1-1.1: ep 0x82 - rounding interval to 64 microframes, ep desc says 80 microframes
553 [ 3.652310] byt-rt5640 byt-rt5640: ASoC: CPU DAI baytrail-pcm-audio not registered
554 [ 3.652338] platform byt-rt5640: Driver byt-rt5640 requests probe deferral
555 [ 3.653581] byt-rt5640 byt-rt5640: ASoC: CPU DAI baytrail-pcm-audio not registered
O seu dispositivo de áudio é um Intel SST Audio, para que o som funcione de que você precisa para instalar o non-free firmware firmware-intel-sound de backport:
Adicione a seguinte linha ao seu sources.list
# Backports repository
deb http://httpredir.debian.org/debian jessie-backports main contrib non-free
Atualizar e insatll firmware-intel-sound :
apt-get update
apt-get -t jessie-backports install firmware-intel-sound