[Bug 1710941] Re: Bluetooth stopped working after kernel update 4.4.0-91

I may be running into the same issue as reported here. Has any progress
been made, or any workaround been found?

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Title:
Bluetooth stopped working after kernel update 4.4.0-91

Status in bluez package in Ubuntu:
Invalid
Status in linux package in Ubuntu:
Confirmed

Bug description:
Bluetooth connection to Bose Soundlink II have been fine for years.
Applied a few new updates in the last day or two --- system was
generally up to date, I don't often wait more than a week or so ---
and now I can no longer connect. Removed the device and re-paired
just fine, although the speaker did not connect as it usually does
after the pairing (i.e., it stayed in pairing mode).

Messages in syslog:

Aug 15 20:32:07 n1 bluetoothd[1075]: connect error: Connection refused (111)
Aug 15 20:32:07 n1 bluetoothd[1075]: GLib: Source ID 276 was not found when attempting to remove it
Aug 15 20:32:11 n1 bluetoothd[1075]: connect error: Connection refused (111)
Aug 15 20:32:42 n1 bluetoothd[1075]: connect error: Connection refused (111)
Aug 15 20:32:42 n1 bluetoothd[1075]: GLib: Source ID 287 was not found when attempting to remove it
Aug 15 20:32:46 n1 bluetoothd[1075]: connect error: Connection refused (111)
Aug 15 20:33:07 n1 bluetoothd[1075]: connect error: Host is down (112)
Aug 15 20:33:07 n1 bluetoothd[1075]: GLib: Source ID 305 was not found when attempting to remove it

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: bluez 5.37-0ubuntu5
ProcVersionSignature: Ubuntu 4.4.0-91.114-generic 4.4.76
Uname: Linux 4.4.0-91-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.10
Architecture: amd64
CurrentDesktop: Unity
Date: Tue Aug 15 20:34:34 2017
InstallationDate: Installed on 2015-12-26 (597 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
InterestingModules: rfcomm bnep btusb bluetooth
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-91-generic root=UUID=5950fbba-cde1-49ac-a918-04e517894c57 ro quiet splash vt.handoff=7
SourcePackage: bluez
UpgradeStatus: Upgraded to xenial on 2017-02-28 (168 days ago)
dmi.bios.date: 01/18/2017
dmi.bios.vendor: Intel Corporation
dmi.bios.version: RYBDWi35.86A.0362.2017.0118.0940
dmi.board.name: NUC5i5RYB
dmi.board.vendor: Intel Corporation
dmi.board.version: H40999-504
dmi.chassis.type: 3
dmi.modalias: dmi:bvnIntelCorporation:bvrRYBDWi35.86A.0362.2017.0118.0940:bd01/18/2017:svn:pn:pvr:rvnIntelCorporation:rnNUC5i5RYB:rvrH40999-504:cvn:ct3:cvr:
hciconfig:
hci0: Type: BR/EDR Bus: USB
BD Address: DC:53:60:97:55:17 ACL MTU: 1021:5 SCO MTU: 96:6
UP RUNNING PSCAN
RX bytes:6896 acl:46 sco:0 events:294 errors:0
TX bytes:4254 acl:32 sco:0 commands:156 errors:0
mtime.conffile..etc.bluetooth.main.conf: 2015-12-29T07:24:08.439240

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