Ubuntu System no sound solution

It seems that there is a software to put the video, there is no sound. Behind the web search for a simple and brutal method, the effect is obvious, change the authority directly after the sound.

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Today, I suddenly get the system no sound, find the problem:

The root cause is that the user loses access to the audio device. You can use the command

ls -la /dev/snd

To view the usage rights of the audio device. For example, under my system , the output

Total 0
Drwxr-xr-x   2 root root    180 2008-05-14 08:53.
Drwxr-xr-x  root root   4580 2008-05-15 13:01..
CRW-RW----+  1 root root, 8 2008-05-14 08:53 controlC0
CRW-RW----+  1 root root, 7 2008-05-14 08:53 hwc0d2
CRW-RW----+  1 root root, 6 2008-05-14 08:54 pcmc0d0c
CRW-RW----+  1 root root, 5 2008-05-14 14:04 pcmc0d0p
CRW-RW----+  1 root root, 4 2008-05-14 08:53 pcmc0d1p
CRW-RW----+  1 root root, 3 2008-05-14 08:53 seq
CRW-RW----+  1 root root, 2 2008-05-14 08:53 timer

This means that only users of the root and audio groups can use the audio device. That's why

Under root , Volume Control works fine and cannot be used by other users.  may be

Some error actions remove the user  from the audio group and are unable to use a sound device.

The solution is

sudo chmod-r a+rwx/dev/snd

This will allow all users to access the audio device.

A more appropriate approach is to

sudo usermod-a-G audiousrname.

Note: The first command I used solves the problem, bingo!

Refer

http://blog.csdn.net/hecssy/article/details/2816887

2. http://forum.ubuntu.org.cn/viewtopic.php?f=42&t=154789&start=0
Original source: http://blog.sina.com.cn/s/blog_6cbd708301011yyb.html

Ubuntu System no sound solution