From a private bug filed earlier: (bug #/1383236)
Whenever urfkill tries to on/off wifi, mtk_wmtd occupies CPU a lot and makes hickup on audio. For testing, "setprop urfkill.hybris.wlan 0" and "pkill urfkilld" wouldn't invoke mtk_wmtd and no hickup any more.
From a private bug filed earlier: (bug #/1383236)
Whenever urfkill tries to on/off wifi, mtk_wmtd occupies CPU a lot and makes hickup on audio.
For testing, "setprop urfkill.hybris.wlan 0" and "pkill urfkilld" wouldn't invoke mtk_wmtd and no hickup any more.