I am install archlinux(64) on nootbok MSI CR640
i am use alsa system

aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: CONEXANT Analog [CONEXANT Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 3: HDMI 0 [HDMI 0]
Subdevices: 1/1
Subdevice #0: subdevice #0

installed alsa-utils,alsa-plugins,add user in audio group
but
speaker-test -c 5
nothing

Okay,

Have you used alsamixer to unmute everything and set the volume higher?

Thor

Yes.Ido.
While i adjust sound system,I had message ~~ "not found driver for this device"?.
lsmod|grep snd
snd_hda_codec_hdmi 24121 1
snd_hda_codec_conexant 47186 1
snd_hda_intel 23343 0
snd_hda_codec 89160 3 snd_hda_intel,snd_hda_codec_conexant,snd_hda_codec_hdmi
snd_hwdep 6389 1 snd_hda_codec
snd_pcm 74780 3 snd_hda_codec,snd_hda_intel,snd_hda_codec_hdmi
snd_page_alloc 7153 2 snd_pcm,snd_hda_intel
snd_timer 19544 1 snd_pcm
snd 59214 7 snd_timer,snd_pcm,snd_hwdep,snd_hda_codec,snd_hda_intel,snd_hda_codec_conexant,snd_hda_codec_hdmi
soundcore 6210 1 snd
......................
thank all/
All work!!!!
problem solved!!!!!