I have the same issue on an HP Omen 15 notebook (15-ax201TX). I have a duel boot setup to Ubuntu 16.10 and Windows 10. If I boot into Windows 10 first (even just to the login screen) and then restart and boot into Ubuntu 16.10 the sound is fine - no crackling.
I have the same issue on an HP Omen 15 notebook (15-ax201TX). I have a duel boot setup to Ubuntu 16.10 and Windows 10. If I boot into Windows 10 first (even just to the login screen) and then restart and boot into Ubuntu 16.10 the sound is fine - no crackling.