Comment 93 for bug 525149

David Henningsson (diwic) wrote :

Hi,

The other day there was a quirk called sony_vaio_gpio2 applied upstream that seemed to have helped people with only one speaker working. So try the following:
1) uninstalling the dkms package at http://people.canonical.com/~diwic/temp/alsa-intel-hda-diwic-dkms_1.0.23.diwic_all.deb (if installed)
2) https://wiki.ubuntu.com/Audio/InstallingLinuxAlsaDriverModules
3) reboot and test