Debugging method for reference if the sound card does not work

If the sound card does not work, refer to the debugging method-Linux general technology-Linux technology and application information. The following is a detailed description. Taking Everest Linux as an Example

1. Check whether the sound card driver is loaded:
Lsmod | grep snd
The output is displayed.

2. Check whether kmix is working. If it is not working, it will show a Red Cross (this indicates that the driver is abnormal)

If all of the above are OK, the sound card driver is working properly.

3. confirm that the driver is loaded without errors or warning:
Dmesg | grep snd
If the audio card driver is loaded without output, the audio card driver is normal.
If there is warning output, post it.

4. If the above information is OK, check the following information:
Aplay-l
Lspci-s $ (lspci | grep-I audio | cut-f 1-d')-v
Lspci-s $ (lspci | grep-I audio | cut-f 1-d')-v-n

Your sound card may still have no sound, for example, because of driver parameters.