为什么我的蓝牙耳机会从声音设置中消失，我该如何取回？
有点类似于此 ，我在Ubuntu配对我的蓝牙耳机（Turtle Beach Ear Force PX5），配对后首先出现在“声音设置”中。 它最初没有工作，所以我开始调整一些设置。 我在麦克风上调整了一个设置，突然输出/输入设备都消失了。 该设备可与Windows配合使用，但要同时使用我的手机（耳机为2ch），我通常会禁用麦克风并仅在需要时启用它。
我从bluetoothd捕获了调试输出：
bluetoothd[31789]: audio/headset.c:headset_connect_cb() /org/bluez/31789/hci0/dev_00_13_8A_4E_64_03: Connected to 00:13:8A:4E:64:03 bluetoothd[31789]: audio/headset.c:handle_event() Received AT+BRSF=9 bluetoothd[31789]: audio/headset.c:print_hf_features() HFP HF features: "EC and/or NR function" "Voice recognition activation" bluetoothd[31789]: audio/headset.c:handle_event() Received AT+CIND=? bluetoothd[31789]: audio/headset.c:handle_event() Received AT+CIND? bluetoothd[31789]: audio/headset.c:handle_event() Received AT+CMER=3, 0, 0, 1 bluetoothd[31789]: audio/headset.c:event_reporting() Event reporting (CMER): mode=3, ind=1 bluetoothd[31789]: audio/headset.c:hfp_slc_complete() HFP Service Level Connection established bluetoothd[31789]: audio/telephony.c:telephony_device_connected() telephony-dummy: device 0x7fa1944b6f10 connected bluetoothd[31789]: audio/headset.c:headset_set_state() State changed /org/bluez/31789/hci0/dev_00_13_8A_4E_64_03: HEADSET_STATE_CONNECTING -> HEADSET_STATE_CONNECTED bluetoothd[31789]: audio/media.c:headset_state_changed() bluetoothd[31789]: audio/avdtp.c:avdtp_ref() 0x7fa1944b9e00: ref=2 bluetoothd[31789]: audio/avdtp.c:avdtp_ref() 0x7fa1944b9e00: ref=3 bluetoothd[31789]: audio/sink.c:sink_set_state() State changed /org/bluez/31789/hci0/dev_00_13_8A_4E_64_03: SINK_STATE_DISCONNECTED -> SINK_STATE_CONNECTING bluetoothd[31789]: audio/avdtp.c:avdtp_unref() 0x7fa1944b9e00: ref=2 bluetoothd[31789]: Connection refused (111) bluetoothd[31789]: audio/avdtp.c:connection_lost() Disconnected from 00:13:8A:4E:64:03 bluetoothd[31789]: audio/avdtp.c:avdtp_unref() 0x7fa1944b9e00: ref=1 bluetoothd[31789]: audio/sink.c:sink_set_state() State changed /org/bluez/31789/hci0/dev_00_13_8A_4E_64_03: SINK_STATE_CONNECTING -> SINK_STATE_DISCONNECTED bluetoothd[31789]: audio/sink.c:discovery_complete() connect:connect XCASE detected bluetoothd[31789]: audio/sink.c:sink_set_state() State changed /org/bluez/31789/hci0/dev_00_13_8A_4E_64_03: SINK_STATE_DISCONNECTED -> SINK_STATE_DISCONNECTED bluetoothd[31789]: audio/avdtp.c:avdtp_unref() 0x7fa1944b9e00: ref=0 bluetoothd[31789]: audio/avdtp.c:avdtp_unref() 0x7fa1944b9e00: freeing session and removing from list bluetoothd[31789]: audio/unix.c:server_cb() Accepted new client connection on unix socket (fd=30) bluetoothd[31789]: audio/sink.c:stream_setup_retry() Stream setup failed, after XCASE connect:connect 我已经尝试删除和修复设备，但看起来我在深度中意外设置了一些持久性设备设置，并且设备不再出现在声音设置中以允许我更改它。 有没有人有任何指针？ 我正在运行Ubuntu 12.04。
在这里找到我的答案：
使用A2DP通过蓝牙播放音频时，可以消除0.5秒的延迟
blt@aurora:/$ pactl list cards short 0 alsa_card.pci-0000_01_00.1 module-alsa-card.c 1 alsa_card.usb-Generic_Turtle_Beach_USB_Headset_0000000001-00-Headset module-alsa-card.c 2 alsa_card.pci-0000_00_14.2 module-alsa-card.c 8 bluez_card.C8_84_47_04_21_6F module-bluetooth-device.c blt@aurora:/$ pactl set-card-profile bluez_card.C8_84_47_04_21_6F a2dp
它再次有效