OK, I think I finally found the real trigger, helped by John Tanner's comment and Googling the bt_coex_active option. It's trying to simultaneously use bluetooth and a *2.4GHz* wifi network.
Trying that on my hardware results in lots of iwlwifi kernel logging reporting that the device microcode keeps crashing and requiring a hardware reset. This happens both on 4.12 and 4.13, but 4.12 doesn't let it disrupt the bluetooth audio stream, so I didn't notice, but 4.13 kills the bluetooth connection. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1719210 Title: Bluetooth audio to A2DP headset no longer works following upgrade from 4.12 to 4.13 in artful To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1719210/+subscriptions -- ubuntu-bugs mailing list firstname.lastname@example.org https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs