Adding "ao=alsa" to ~/.mplayer/config resolved the issue. I don't know how this issue was introduced, but it started after months of not having any problems.
** Changed in: alsa-driver Status: New => Fix Released ** Changed in: alsa-driver (Ubuntu) Status: New => Fix Released -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/876967 Title: [2757CTO, Conexant CX20561 (Hermosa), Green Headphone Out, Front] No sound at all To manage notifications about this bug go to: https://bugs.launchpad.net/alsa-driver/+bug/876967/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs