Comment 22 for bug 235007

[RESOLVED]
Works like a charm.
I own a lap-top Toshiba Satellite L40-13G (Short Model Name: PSL40E).

All I did was:
Add the line "options snd-hda-intel model=3stack" had to be added to /etc/modprobe.d/alsa-base "
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If you get a "Permission Denied" response when trying to save the file then simply do the following:
1) Open a new shell window
2) Type in
        sudo nano /etc/modprobe.d/alsa-base
3) You may (or may not) be prompted for a root/admin password - type it in
4) Go to the bottom of the file and add the following line
        options snd-hda-intel model=3stack
5) Reboot - you should hear sounds...