XPS 15 9560, linux kernel 4.10.0-38-generic, Ubuntu 17.04
After trying everything in this thread (and failing) I finally got my
sound back on my headphones.
1) Install:
sudo apt-get install alsa-tools-gui
2) Launch:
hdajackretask
3) Check 'Show unconnected pins'
4) Check "override" on 0x21.
Changing the kernel parameters as proposed by Elias allowed me to
successfully select the intel card using prime-select. This cut my power
consumption in half (30 W -> 16 W as reported by powertop).
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