ヘッドフォンが見つからない、ブルートゥースが動作しているように見え、他のデバイスを見つける
Ubuntu 18.04を使用しています。 Bluetoothヘッドフォン（Sony WS-CH500）を購入しましたが、デバイスが見つからないか、MACアドレスで接続できないため、PCとペアリングできません。電話（OnePlus 5T）とスピーカー（Doss Soundbox）を問題なく接続できるため、PCの問題ではないようです。ヘッドフォンをスマートフォンに接続してみましたが、問題は発生しませんでした。私は本当に問題がどこにあるのか理解できません...誰かが私を助けるかもしれません
dmesg | egrep -i 'blue|firm'の出力は次のとおりです。
[ 0.028000] Spectre V2 : Enabling Restricted Speculation for firmware calls
[ 2.206837] [drm] Finished loading DMC firmware i915/kbl_dmc_ver1_01.bin (v1.1)
[ 4.748174] iwlwifi 0000:02:00.0: loaded firmware version 34.0.1 op_mode iwlmvm
[ 5.772130] Bluetooth: Core ver 2.22
[ 5.772142] Bluetooth: HCI device and connection manager initialized
[ 5.772145] Bluetooth: HCI socket layer initialized
[ 5.772146] Bluetooth: L2CAP socket layer initialized
[ 5.772155] Bluetooth: SCO socket layer initialized
[ 5.914233] Bluetooth: hci0: Firmware revision 0.1 build 185 week 49 2017
[ 5.981887] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[ 5.981888] Bluetooth: BNEP filters: protocol multicast
[ 5.981891] Bluetooth: BNEP socket layer initialized
[ 30.026287] Bluetooth: RFCOMM TTY layer initialized
[ 30.026297] Bluetooth: RFCOMM socket layer initialized
[ 30.026308] Bluetooth: RFCOMM ver 1.11
[ 69.673237] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 85.950240] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 121.135210] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 137.007251] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 152.870230] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 169.022205] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 184.882155] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 201.006216] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 500.039226] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 515.908232] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 532.043233] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 547.913218] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 564.048221] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 579.926361] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 596.048196] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 611.929509] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 628.060226] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 643.942226] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 660.067386] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 675.943146] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 692.079540] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 707.951218] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 724.076189] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 739.951280] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 756.083512] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 771.970208] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 788.095243] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 803.968232] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 820.093226] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 835.953255] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 852.074241] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 867.940212] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 884.063225] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 899.920221] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 916.052371] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 931.918563] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 948.040188] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 963.909411] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 1001.030233] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 1016.899230] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 1033.020240] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 1865.396152] Bluetooth: hci0: Bootloader revision 0.0 build 26 week 38 2015
[ 1865.396929] Bluetooth: hci0: Device revision is 16
[ 1865.396930] Bluetooth: hci0: Secure boot is enabled
[ 1865.396931] Bluetooth: hci0: OTP lock is enabled
[ 1865.396932] Bluetooth: hci0: API lock is enabled
[ 1865.396933] Bluetooth: hci0: Debug lock is disabled
[ 1865.396934] Bluetooth: hci0: Minimum firmware build 1 week 10 2014
[ 1865.398892] Bluetooth: hci0: Found device firmware: intel/ibt-12-16.sfi
[ 1866.852269] Bluetooth: hci0: Waiting for firmware download to complete
[ 1866.852937] Bluetooth: hci0: Firmware loaded in 1424562 usecs
[ 1866.853216] Bluetooth: hci0: Waiting for device to boot
[ 1866.870072] Bluetooth: hci0: Device booted in 16615 usecs
[ 1866.870331] Bluetooth: hci0: Found Intel DDC parameters: intel/ibt-12-16.ddc
[ 1866.873120] Bluetooth: hci0: Applying Intel DDC parameters completed
[ 1909.001342] iwlwifi 0000:02:00.0: Loaded firmware version: 34.0.1
[ 1912.875329] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 1929.000196] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 1944.873994] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 1961.001042] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 1976.872964] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 1992.996004] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 2008.872326] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 2024.998072] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 2040.868045] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 2056.991984] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 2072.868961] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 2088.988970] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 2104.862094] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 2120.988214] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 2136.871000] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 2152.996236] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 2168.866336] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 2184.987984] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 2200.872026] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 2216.997057] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 2232.859028] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 2248.991020] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 2264.861318] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 2280.992994] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 2296.866977] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 2312.994991] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 2328.879229] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 2344.991999] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 2358.816975] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 2374.946991] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 2391.071978] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 2406.943934] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 2423.074002] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 2438.942961] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 2455.077361] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 2470.840433] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 2489.843934] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3012.892000] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3029.019032] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3044.889318] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3061.017996] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3076.884328] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3093.016005] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3108.884944] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3125.020018] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3140.883953] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3157.021125] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3172.886223] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3189.013037] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3204.889010] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3221.026026] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3236.913026] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3253.049199] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3268.932944] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3285.071271] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3300.954319] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3317.075963] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3332.959963] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3349.084194] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3364.950993] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3381.080200] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3396.945032] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3413.084027] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3428.950324] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3445.075999] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3460.943998] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3477.075321] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3492.949990] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3509.084202] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3524.961000] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3541.084001] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3556.958275] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3573.094213] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3588.961005] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3605.096054] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3629.914992] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3645.649016] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3661.776995] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3678.009999] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3693.881311] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3710.006000] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3725.880994] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3742.005005] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3757.878334] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3774.001160] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3789.869959] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3806.000186] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3821.882011] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3833.908191] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3850.035001] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3865.914010] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3882.050958] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3897.924334] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3914.061124] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3929.937170] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3946.072993] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3961.937987] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3978.075170] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 3993.943997] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 4010.077980] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 4025.953983] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 4042.081992] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 4057.957955] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 4074.097994] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 4089.964012] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 4106.096185] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 4121.972946] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 4138.099993] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 4153.982997] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 4170.100014] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 4185.977018] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 4202.106966] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 4217.975995] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 4234.109977] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 4249.990312] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 4266.109148] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 4281.999032] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 4298.112155] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 4313.992000] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 4330.113008] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 4345.988964] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 4362.128001] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 4377.997029] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 4394.128003] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 4409.997008] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 4426.123996] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 4442.002000] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 4458.137038] Bluetooth: hci0: last event is not cmd complete (0x0f)
およびlspci：
00:00.0 Host bridge: Intel Corporation Xeon E3-1200 v6/7th Gen Core Processor Host Bridge/DRAM Registers (rev 08)
00:02.0 VGA compatible controller: Intel Corporation UHD Graphics 620 (rev 07)
00:04.0 Signal processing controller: Intel Corporation Skylake Processor Thermal Subsystem (rev 08)
00:14.0 USB controller: Intel Corporation Sunrise Point-LP USB 3.0 xHCI Controller (rev 21)
00:14.2 Signal processing controller: Intel Corporation Sunrise Point-LP Thermal subsystem (rev 21)
00:15.0 Signal processing controller: Intel Corporation Sunrise Point-LP Serial IO I2C Controller #0 (rev 21)
00:15.1 Signal processing controller: Intel Corporation Sunrise Point-LP Serial IO I2C Controller #1 (rev 21)
00:16.0 Communication controller: Intel Corporation Sunrise Point-LP CSME HECI #1 (rev 21)
00:17.0 SATA controller: Intel Corporation Sunrise Point-LP SATA Controller [AHCI mode] (rev 21)
00:1c.0 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express Root Port (rev f1)
00:1c.5 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express Root Port #6 (rev f1)
00:1e.0 Signal processing controller: Intel Corporation Sunrise Point-LP Serial IO UART Controller #0 (rev 21)
00:1e.2 Signal processing controller: Intel Corporation Sunrise Point-LP Serial IO SPI Controller #0 (rev 21)
00:1f.0 ISA bridge: Intel Corporation Device 9d4e (rev 21)
00:1f.2 Memory controller: Intel Corporation Sunrise Point-LP PMC (rev 21)
00:1f.3 Audio device: Intel Corporation Sunrise Point-LP HD Audio (rev 21)
00:1f.4 SMBus: Intel Corporation Sunrise Point-LP SMBus (rev 21)
01:00.0 3D controller: NVIDIA Corporation GM108M [GeForce 940MX] (rev a2)
02:00.0 Network controller: Intel Corporation Wireless 8265 / 8275 (rev 78)
Bluetoothは...の悪臭を放つ山であり、まあ、それは 複雑でフレーク状の混乱 であり、それは何らかの形で妥当な時間内に安定して動作します。
実際、ほとんどすべてのbluetooth実装はさまざまな方法でバグがあります。したがって、PCが一部のデバイスで動作する場合でも、この場合の問題はPC側にある可能性があります。
または、Bluetoothヘッドフォンをオンにし、検出可能なモードにしないことと同じくらい簡単な場合もあります（ヘッドフォンのマニュアルを確認してください）。
https://wiki.debian.org/BluetoothUser にはさまざまなアプローチがあるため、役立つことがわかりました