Public bug reported:

1) lsb_release -rd
Description:    Ubuntu 18.04.1 LTS
Release:        18.04

2) $ apt-cache policy bluez
bluez:
  Installed: 5.48-0ubuntu3.1
  Candidate: 5.48-0ubuntu3.1
  Version table:
 *** 5.48-0ubuntu3.1 500
        500 http://us.archive.ubuntu.com/ubuntu bionic-updates/main amd64 
Packages
        100 /var/lib/dpkg/status
     5.48-0ubuntu3 500
        500 http://us.archive.ubuntu.com/ubuntu bionic/main amd64 Packages

3) bluetooth headphones stay working in a2dp mode even after suspend

4) bluetooth headphones connect but no sound will come out of a2dp mode,
only in HSP profile

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: bluez 5.48-0ubuntu3.1
ProcVersionSignature: Ubuntu 4.15.0-30.32-generic 4.15.18
Uname: Linux 4.15.0-30-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Wed Aug 29 18:07:26 2018
InstallationDate: Installed on 2018-05-26 (95 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180525)
InterestingModules: rfcomm bnep btusb bluetooth
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-30-generic 
root=UUID=9e84ffd4-d629-4dcd-a6c4-6648d1a34665 ro quiet splash vt.handoff=1
SourcePackage: bluez
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 03/16/2015
dmi.bios.vendor: Intel Corp.
dmi.bios.version: RKPPT10H.86A.0041.2015.0316.1442
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: D53427RKE
dmi.board.vendor: Intel Corporation
dmi.board.version: G87971-406
dmi.chassis.type: 3
dmi.modalias: 
dmi:bvnIntelCorp.:bvrRKPPT10H.86A.0041.2015.0316.1442:bd03/16/2015:svn:pn:pvr:rvnIntelCorporation:rnD53427RKE:rvrG87971-406:cvn:ct3:cvr:
dmi.product.family: To be filled by O.E.M.
hciconfig:
 hci0:  Type: Primary  Bus: USB
        BD Address: 48:51:B7:07:93:F5  ACL MTU: 1021:5  SCO MTU: 96:5
        DOWN 
        RX bytes:5617087 acl:790 sco:22622 events:634625 errors:0
        TX bytes:540631745 acl:632348 sco:22584 commands:537 errors:0

** Affects: bluez (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic

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https://bugs.launchpad.net/bugs/1789758

Title:
  bluetooth headphones a2dp profile does not function after suspend

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