Same problem here. I don't know if this information helps, but switching "Independent HP" off in alsamixer mutes the headphones and keeps the speakers on.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/776390 Title: [K50AB, VIA VT1708S, Green Headphone Out, Rear] Playback problem -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs