Ubuntu
alsa-driver package

No sound card detected on LGR480 laptop.

Asked by Pete Dalziel

After recently installing Ubuntu 12.04.3 LTS on an LG R480 laptop, everything seemed to function fine. Hours later, after installing automatically downloaded updates and rebooting, there was no sound output. On the sound settings panel it described the audio device as 'dummy output'. I took steps to re-install Ubuntu 12.04.3 LTS on my machine with a view to perhaps isolating an offending update. However after booting into Ubuntu for the first time after the re-installation, the same problem existed. - dummy output. Later, after 212 updates were installed, and a proprietary graphics driver, the problem persists.

I ran;

wget -O alsa-info.sh http://www.alsa-project.org/alsa-info.sh && chmod +x ./alsa-info.sh && ./alsa-info.sh

which generated;

http://www.alsa-project.org/db/?f=1d26813bd3f0916d81dce2fd2874ad8b445f666c

As far as I can determine, no sound device is detected.
Incidentally, I also have xp running on this machine, and have a very similar problem there; no sound card detected, but believe this to be due to chipset driver availability issues supporting xp for this machine.
I also believe the internal audio device communicates with the computer via USB, rather than PCI if that might be of help.
Unless something has physically happened to the Audio device, which is unlikely since the laptop has hardly moved, since the audio last functioned, I am at a loss as what to try next.

Any help would be very appreciated.

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Ubuntu alsa-driver Edit question
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Pete Dalziel
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actionparsnip (andrew-woodhead666) said : 		#1

Run:

sudo add-apt-repository ppa:ubuntu-audio-dev/ppa; sudo apt-get update;sudo apt-get dist-upgrade; sudo apt-get install pavucontrol linux-sound-base alsa-base alsa-utils lightdm ubuntu-desktop linux-image-`uname -r` libasound2; sudo apt-get -y --reinstall install linux-sound-base alsa-base alsa-utils lightdm ubuntu-desktop linux-image-`uname -r` libasound2; killall pulseaudio; rm -r ~/.pulse*; ubuntu-support-status; sudo usermod -aG `cat /etc/group | grep -e '^pulse:' -e '^audio:' -e '^pulse-access:' -e '^pulse-rt:' -e '^video:' | awk -F: '{print $1}' | tr '\n' ',' | sed 's:,$::g'` `whoami`

Then reboot

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Pete Dalziel (petedalziel77) said : 		#2

Thanks, but after running the above code, nothing has changed with regard to my sound problem.

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Daniel Letzeisen (dtl131) said : 		#3

https://wiki.ubuntu.com/Audio/UpgradingAlsa/DKMS

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Pete Dalziel (petedalziel77) said : 		#4

After installing the correct package for my kernel version from; https://wiki.ubuntu.com/Audio/UpgradingAlsa/DKMS. and rebooting, nothing seems to have changed.

Still displaying 'dummy output' as the device in the sound settings pannel.

Any further advice would be gratefully accepted.

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Daniel Letzeisen (dtl131) said : 		#5

WHat happens when you try to manually load sound modules?

sudo modprobe -v snd-hda-intel

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Pete Dalziel (petedalziel77) said : 		#6

After entering;

 sudo modprobe -v snd-hda-intel...

This is what is returned;

insmod /lib/modules/3.8.0-35-generic/kernel/sound/core/snd-page-alloc.ko
insmod /lib/modules/3.8.0-35-generic/kernel/sound/soundcore.ko
install /sbin/modprobe --ignore-install snd && { /sbin/modprobe --quiet --use-blacklist snd-ioctl32 ; /sbin/modprobe --quiet --use-blacklist snd-seq ; }
insmod /lib/modules/3.8.0-35-generic/kernel/sound/core/snd.ko
insmod /lib/modules/3.8.0-35-generic/kernel/sound/core/seq/snd-seq-device.ko
insmod /lib/modules/3.8.0-35-generic/kernel/sound/core/snd-timer.ko
install /sbin/modprobe --ignore-install snd-seq && { /sbin/modprobe --quiet --use-blacklist snd-seq-midi ; /sbin/modprobe --quiet --use-blacklist snd-seq-oss ; : ; }
insmod /lib/modules/3.8.0-35-generic/kernel/sound/core/seq/snd-seq.ko
insmod /lib/modules/3.8.0-35-generic/kernel/sound/core/seq/snd-seq-midi-event.ko
install /sbin/modprobe --ignore-install snd-rawmidi && { /sbin/modprobe --quiet --use-blacklist snd-seq-midi ; : ; }
insmod /lib/modules/3.8.0-35-generic/kernel/sound/core/snd-rawmidi.ko
insmod /lib/modules/3.8.0-35-generic/kernel/sound/core/seq/snd-seq-midi.ko
install /sbin/modprobe --ignore-install snd-pcm && { /sbin/modprobe --quiet --use-blacklist snd-pcm-oss ; : ; }
insmod /lib/modules/3.8.0-35-generic/kernel/sound/core/snd-pcm.ko
insmod /lib/modules/3.8.0-35-generic/kernel/sound/core/snd-hwdep.ko
insmod /lib/modules/3.8.0-35-generic/updates/dkms/snd-hda-codec.ko
insmod /lib/modules/3.8.0-35-generic/updates/dkms/snd-hda-intel.ko

Am I supposed to install something from this list?

I then rebooted the system but nothing had changed - still 'dummy output'.

However, I don't know whether this was the case before, but when a youtube video is running, in the sound settings panel under 'Applications' -' ALSA plug-in [plug-in container]' is listed with a volume slider, which when adjusted, has no apparent effect.

I also installed GNOME ALSA Mixer from the software centre, but when this application is opened, there is nothing but a blank white box.

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Pete Dalziel (petedalziel77) said : 		#7

Audio is now working fine. After a recent batch of updates, or the changes made as per advised here, or a combination of both, I don't know, but Many thanks to all who helped.