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I have a Dell Optiplex 780 running Ubuntu 11.10. Recently I had to hard reset that PC. After that restart, my audio device was no longer detected. Previously, audio had worked fine. The audio/speaker icon in the right hand corner cannot change volume as no audio device is detected.

The sound card is provided by the on-board Intel ICH-10 chipset.
lspci gives:
00:1b.0 Audio device: Intel Corporation 82801JD/DO (ICH10 Family) HD Audio Controller (rev 02)

I tried logging in to both my own user account, as well as root. No audio device is detected. What are my options to troubleshoot this problem?

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You could try "lspci" in the terminal emulator and look for anything listed as "audio" to determine your soundcard type. –  washbow Mar 7 '13 at 21:00
    
@washbow thanks. Will do it and let know. Any further pointers. –  goldenmean Mar 7 '13 at 22:06
    
lspci -v listed the sound card as : 00:1b.0 Audio device: Intel Corporation 82801JD/DO (ICH10 Family) HD Audio Controller (rev 02) Does this mean, its the driver which could be unloaded for some reason. Now which is the driver snd or alsa ? –  goldenmean Mar 8 '13 at 9:51
    
please post the output of "dpkg -l | grep alsa". Did you run an update just before you lost sound? –  washbow Mar 8 '13 at 18:52
    
also does "lspci -v" give details of the kernel modules in use? –  washbow Mar 8 '13 at 19:03

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