Do you have a weird set up? I have an XPS 9560, and it's always just worked with Ubuntu.
I had some issues getting some Bluetooth headphones working a while ago, but eventually a new Ubuntu release came out, and it was back to working out-of-the-box.
Hits close to home. I've had to do weird kernel workarounds for the last 6 months to get working sound on a Dell XPS.