Ubuntu12.10 no sound in the notebook or the sound card cannot be recognized

Recently, I replaced my old system with Ubuntu12.10server and planned to give up Gnome in an all-round way. I will not introduce it when I upgrade my system from the Server to the desktop environment. I found several problems: first, nvidia's latest graphics Driver (nvidia-current) is not compatible with my old version (acer4720g). Shutting Down the gui will cause the system to crash. The cause is unknown. 2. If gnome is not installed, no sound will be triggered by default. Start with the topic. To solve the problem of no sound, I g

Recently, I replaced my old system with Ubuntu 12.10 server and planned to give up Gnome.

I will not introduce the upgrade from the Server to the desktop environment.

Several problems found:

1. nvidia's latest graphics Driver (nvidia-current) is not compatible with my old version (acer 4720g). Shutting Down gui programs will cause the system to crash. The cause is unknown.

2. If gnome is not installed, no sound will be triggered by default.

Start with the topic.

To solve the problem of no sound, I google for a long time and finally found a solution.

This problem occurs because my laptop uses an integrated sound card, but alsa is not correctly configured.

First, determine whether a common user has the permission to access alsamixer.

If an error occurs during execution by a common user, it may be caused by permission issues. The solution is to add the current user to audio or directly execute

Chmod 777/dev/snd /*

Then you can run alsamixer to test the effect. If yes, whether your sound card has been recognized. And adjust the volume.

If the problem cannot be solved, refer to the following:

Old bird can skip the following paragraph direct reference: https://help.ubuntu.com/community/HdaIntelSoundHowto

Explanation:

$ Cat/proc/asound/card0/codec * | grep Codec

This is used to determine the sound card type.

/Usr/share/doc/alsa-base/driver/HD-Audio-Models.txt.gz

This file is actually a txt file and does not need to be decompressed.

In this document, I mainly find a model suitable for your laptop or platform model. I tried some models here and finally confirmed that my notebook should use acer-aspire as the model, that is, in/etc/modprobe. d/last addition of alsa-base.conf

Options snd-hda-intel model = acer-aspire

Restart or execute sudo alsa force-reload to check whether there is sound.