This sequence solved same problem on my Thinkpad X230 :
1. Go to Software Manager and install the GNOME ALSA Mixer
2. Go to this link:https://code.launchpad.net/~ubuntu-audi
- Click on the Quantal package
- Click on the .deb package
- Click on "Save File"
- When the "Downloads" box pops up, click on the new download and then click on "Install"
- Restart computer and then test it out. You should be able to close computer lid, suspend, and then hear sound from the speakers when resuming.