Not gone for me (stock, unrooted running 5.7.893). My Bionic sits in the car dock on my daily commute every day and I hear the whine about half the time. This morning it was particularly bad. I heard it as soon as I plugged in the 3.5mm cable. I reached for the phone, hit the volume down button twice then the volume up button and the whine goes away.
It's still a problem.