I have a weird problem. Sound used to work until a couple of days ago, but now the builtin speakers in my ThinkPad W520 have stopped working. This happened after either:

1. An update
2. Using the headphone jack in my laptop dock (I had used the jack in the actual laptop before without issues)

As I was saying, the speakers do not work at all. Sometimes I get a clicking sound from the laptop, which I assume is the system beep. This does not happen consistently. If I plug headphones in the laptop, I do get sound in them.

I have tried playing with all the possible settings both in gnome and using alsamixer. Some screens:

What could I try next?