I'm having this same problem on my Lenovo T430 and Ultrabase Series 3.
No audio from the dock jack.
I've also commented on bug 893611 since that's also related but I'm a little confused whether I should be commenting on all of these bugs that I find that don't use the exact same model of laptop as I do or whether I should create a new bug for my exact configuration.
I'm having this same problem on my Lenovo T430 and Ultrabase Series 3.
No audio from the dock jack.
I've also commented on bug 893611 since that's also related but I'm a little confused whether I should be commenting on all of these bugs that I find that don't use the exact same model of laptop as I do or whether I should create a new bug for my exact configuration.