Codec + Mixer: SigmaTel STAC9200 - card 0: NVidia [HDA NVidia], device 0: STAC92xx Analog [STAC92xx Analog] Audio device: nVidia Corporation MCP51 High Definition Audio (rev a2) - no sound output on Dell OptiPlex 740 in Ubuntu 10.04.1 LTS - using ALSA driver version 1.0.21

Hi,

Please try this procedure:

1. copy-paste the following command into the Terminal:

gksudo gedit /etc/modprobe.d/alsa-base.conf

2. Using the gedit editor, add the following lines to the end of the /etc/modprobe.d/alsa-base.conf file:

# Keep snd-pcsp from beeing loaded as first soundcard
options snd-pcsp index=-2
alias snd-card-0 snd-hda-intel
alias sound-slot-0 snd-hda-intel
options snd-hda-intel model=dell-d21

3. reboot and retest sound using headphones and speakers

4. If the dell-d21 alsa-base.conf option does not work, please try one of the following, reboot your pc and retest sound using headphones and speakers.

Only set ONE model option at a time in the alsa-base.conf file between EACH reboot. Do NOT mix several model options in the /etc/modprobe.d/alsa-base.conf file!

295 STAC9200
296 ========
297 ref Reference board
298 oqo OQO Model 2
299 dell-d21 Dell (unknown)
300 dell-d22 Dell (unknown)
301 dell-d23 Dell (unknown)
302 dell-m21 Dell Inspiron 630m, Dell Inspiron 640m
303 dell-m22 Dell Latitude D620, Dell Latitude D820
304 dell-m23 Dell XPS M1710, Dell Precision M90
305 dell-m24 Dell Latitude 120L
306 dell-m25 Dell Inspiron E1505n
307 dell-m26 Dell Inspiron 1501
308 dell-m27 Dell Inspiron E1705/9400
309 gateway-m4 Gateway laptops with EAPD control
310 gateway-m4-2 Gateway laptops with EAPD control
311 panasonic Panasonic CF-74
312 auto BIOS setup (default)

Regards,

Mark

When you suggested I do first worked perfectly. Thank you very much.

Sorry if this has been asked before. Its my first time using linux :)