自从更新到ubuntu 14.04以来，每当我的蓝牙设备空闲或关闭它然后再打开时，它默认为电话设置，而我无法将其默认为a2dp。
我已经搜索过，仅找到了几种可能的解决方案，例如
蓝牙扬声器：首选模式“高保真播放”（A2DP）尚未保存，
但对我却没有用。当我Disable=Headset按照该帖子中的建议使用时，它可以暂时工作，但过一会儿，如果我的设备断开连接，则不会重新连接为音频设备。
我正在使用Bose Soundlink耳机，我的/etc/bluetooth/audio.conf文件如下：
# Configuration file for the audio service
# This section contains options which are not specific to any
# particular interface
[General]
# Switch to master role for incoming connections (defaults to true)
#Master=true
# If we want to disable support for specific services
# Defaults to supporting all implemented services
#Disable=Gateway,Source,Socket
# SCO routing. Either PCM or HCI (in which case audio is routed to/from ALSA)
# Defaults to HCI
#SCORouting=PCM
# Automatically connect both A2DP and HFP/HSP profiles for incoming
# connections. Some headsets that support both profiles will only connect the
# other one automatically so the default setting of true is usually a good
# idea.
AutoConnect=true
# Headset interface specific options (i.e. options which affect how the audio
# service interacts with remote headset devices)
[Headset]
# Set to true to support HFP, false means only HSP is supported
# Defaults to true
HFP=false
HSP=false
# Maximum number of connected HSP/HFP devices per adapter. Defaults to 1
MaxConnected=0
# Set to true to enable use of fast connectable mode (faster page scanning)
# for HFP when incoming call starts. Default settings are restored after
# call is answered or rejected. Page scan interval is much shorter and page
# scan type changed to interlaced. Such allows faster connection initiated
# by a headset.
FastConnectable=false
# Just an example of potential config options for the other interfaces
#[A2DP]
#SBCSources=1
#MPEG12Sources=0