I believe this issue is about to be fixed. Can you please try installing http://people.canonical.com/~diwic/temp/alsa-intel-hda-optiplex-dkms_1.0.23_all.deb , reboot and report back whether it fixes your problem?
I believe this issue is about to be fixed. Can you please try installing http:// people. canonical. com/~diwic/ temp/alsa- intel-hda- optiplex- dkms_1. 0.23_all. deb , reboot and report back whether it fixes your problem?