很抱歉問了一個新手問題，但我的耳機有問題，我已經尋找答案有一段時間了 - 但無濟於事。
當我的耳機自動連接到我的筆記型電腦時（例如，當我打開耳機並且筆記型電腦已經運行時），聲音會設定為「單聲道」。當我重新啟動整個藍牙服務時 - 同樣的事情發生了。
sudo service bluetooth restart
當我斷開耳機並再次手動連接（在 GUI 中）時，它可以在立體聲和預設的高保真度下正常工作。
我嘗試以下那也許這個命令的輸出可以幫助你。當連接不良時：
journalctl -f
-- Logs begin at Tue 2019-01-29 03:11:02 NZDT. --
Apr 01 12:00:55 Yeti-Book gsd-media-keys[3341]: Unable to get default sink
Apr 01 12:01:08 Yeti-Book rtkit-daemon[1367]: Supervising 3 threads of 1 processes of 1 users.
Apr 01 12:01:08 Yeti-Book kernel: Bluetooth: hci0: SCO packet for unknown connection handle 0
Apr 01 12:01:08 Yeti-Book kernel: Bluetooth: hci0: SCO packet for unknown connection handle 0
Apr 01 12:01:08 Yeti-Book kernel: Bluetooth: hci0: SCO packet for unknown connection handle 0
Apr 01 12:01:08 Yeti-Book rtkit-daemon[1367]: Successfully made thread 14688 of process 3178 (n/a) owned by '1000' RT at priority 5.
Apr 01 12:01:08 Yeti-Book rtkit-daemon[1367]: Supervising 4 threads of 1 processes of 1 users.
Apr 01 12:01:08 Yeti-Book kernel: Bluetooth: hci0: SCO packet for unknown connection handle 0
Apr 01 12:01:08 Yeti-Book gsd-media-keys[3341]: Unable to get default source
Apr 01 12:01:09 Yeti-Book kernel: Bluetooth: hci0: last event is not cmd complete (0x0f)
Apr 01 12:01:25 Yeti-Book kernel: Bluetooth: hci0: last event is not cmd complete (0x0f)
Apr 01 12:01:41 Yeti-Book kernel: Bluetooth: hci0: last event is not cmd complete (0x0f)
Apr 01 12:01:57 Yeti-Book kernel: Bluetooth: hci0: last event is not cmd complete (0x0f)
正確連接後：
journalctl -f
-- Logs begin at Tue 2019-01-29 03:11:02 NZDT. --
Apr 01 13:10:43 Yeti-Book kernel: kthread+0x121/0x140
Apr 01 13:10:43 Yeti-Book kernel: ? process_one_work+0x410/0x410
Apr 01 13:10:43 Yeti-Book kernel: ? kthread_create_worker_on_cpu+0x70/0x70
Apr 01 13:10:43 Yeti-Book kernel: ? do_syscall_64+0x73/0x130
Apr 01 13:10:43 Yeti-Book kernel: ? SyS_exit+0x17/0x20
Apr 01 13:10:43 Yeti-Book kernel: ret_from_fork+0x35/0x40
Apr 01 13:10:43 Yeti-Book kernel: Code: 00 00 00 75 26 48 8b 7b 08 e8 1a eb a2 ff 48 8b bb 08 92 00 00 48 89 83 70 a9 00 00 be 08 00 00 00 e8 22 5a 08 00 31 c0 5b 5d c3 <0f> 0b eb d6 66 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 48 89
Apr 01 13:10:43 Yeti-Book kernel: ---[ end trace 34e0ddc48eba8d61 ]---
Apr 01 13:10:43 Yeti-Book kernel: amdgpu 0000:01:00.0: GPU pci config reset
Apr 01 13:10:44 Yeti-Book gnome-shell[3153]: JS ERROR: Exception in callback for signal: activate: Error: Error invoking IBus.set_global_engine_async: Expected function for callback argument callback, got undefined
setEngine@resource:///org/gnome/shell/misc/ibusManager.js:207:9
wrapper@resource:///org/gnome/gjs/modules/_legacy.js:82:22
activateInputSource@resource:///org/gnome/shell/ui/status/keyboard.js:490:13
wrapper@resource:///org/gnome/gjs/modules/_legacy.js:82:22
_emit@resource:///org/gnome/gjs/modules/signals.js:128:27
activate@resource:///org/gnome/shell/ui/status/keyboard.js:65:9
wrapper@resource:///org/gnome/gjs/modules/_legacy.js:82:22
_inputSourcesChanged@resource:///org/gnome/shell/ui/status/keyboard.js:620:13
wrapper@resource:///org/gnome/gjs/modules/_legacy.js:82:22
reload@resource:///org/gnome/shell/ui/status/keyboard.js:369:9
wrapper@resource:///org/gnome/gjs/modules/_legacy.js:82:22
_ibusSetContentType@resource:///org/gnome/shell/ui/status/keyboard.js:691:9
wrapper@resource:///org/gnome/gjs/modules/_legacy.js:82:22
_emit@resource:///org/gnome/gjs/modules/signals.js:128:27
_setContentType@resource:///org/gnome/shell/misc/ibusManager.js:183:9
wrapper@resource:///org/gnome/gjs/modules/_legacy.js:82:22
我正在尋找完整的問題解決方案（問題不再存在）或足夠快的解決方法（如何使用命令列再次斷開和連接設備）。
筆記型電腦是 HP Elitebook 850 G3 系統：Ubuntu 18.04
radoslaw@Yeti-Book:/ $ cat /etc/os-release
NAME="Ubuntu"
VERSION="18.04.2 LTS (Bionic Beaver)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 18.04.2 LTS"
VERSION_ID="18.04"
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
VERSION_CODENAME=bionic
UBUNTU_CODENAME=bionic
radoslaw@Yeti-Book:/ $ uname -a
Linux Yeti-Book 4.15.0-46-generic #49-Ubuntu SMP Wed Feb 6 09:33:07 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
乾杯！
編輯： dmesg輸出連接不良
[516028.247434] Bluetooth: hci0: SCO packet for unknown connection handle 0
[516028.257416] Bluetooth: hci0: SCO packet for unknown connection handle 0
[516028.257436] Bluetooth: hci0: SCO packet for unknown connection handle 0
重新連線後又出現兩行：
[516028.247412] Bluetooth: hci0: SCO packet for unknown connection handle 0
[516028.247434] Bluetooth: hci0: SCO packet for unknown connection handle 0
[516028.257416] Bluetooth: hci0: SCO packet for unknown connection handle 0
[516028.257436] Bluetooth: hci0: SCO packet for unknown connection handle 0
[516111.185452] Bluetooth: hci0: last event is not cmd complete (0x0f)
[516120.375748] input: 70:26:05:89:03:B8 as /devices/virtual/input/input45
答案1
作為解決方法，您可以使用以下方法：
- 安裝
bluetoothctl sudo bluetoothctl- 這應該會導致類似的結果：
# paired-devices
Device CB:B2:CG:26:FD:80 <DEVICE_1_NAME>
Device 70:26:03:89:03:B8 <DEVICE_2_NAME>
- 複製「device」和裝置名稱之間的字串（例如 70:26:03:89:03:B8）
- 將其貼到以下腳本中
sudo bluetoothctl << ANSWERS
disconnect 70:26:03:89:03:B8
ANSWERS
sleep 5s
sudo bluetoothctl << ANSWERS
connect 70:26:03:89:03:B8
ANSWERS
並且您的裝置應該重新連接。
中間的睡眠是為了讓驅動程式完成斷開連接（否則你會得到錯誤）
希望有幫助:)
乾杯