I think when I first installed 13.10 on my Windows 8 ASUS S550CM, the headphones weren't working. I tried suggestions in the following questions:
- Headphones not working in 13.10 after update
- No audio in Ubuntu after upgrade to 13.10
- Fix Ubuntu 13.04 sound
- Headphones not working
And after a few restarts, with no clear solution, it is just fixed all of a sudden. A few more restarts and it stops working again. I go through the same suggestions, restarting, and nothing happens, until eventually I'm restarting for some other reason, and they start working again.
Could this be updates that are enabling/disabling them? What could be happening here?
Update
It seems that restarting the computer is not enough. Once I shut down the computer and turn it on again (without making any other adjustments) the headphones work again. That seems to be the best solution so far, but I still have no idea why it's happening.