Can confirm, Precision M5510 (facsimile of XPS15). I usually have headphones on and even without them the whine is tolerable and becomes part of the background noise, however your annoyance tolerance level will vary.
Does the coil whine only happen with Linux? or does it happen in Windows too?
Was thinking about the latest XPS w/Kaby Lake CPU... but this would give me pause.
As far as I know they haven't resolved it yet.