直到大约一个月前，这还不是问题。现在，每当我连接到任何蓝牙扬声器时，它都会在大约 3 分钟后断开连接，通常是在空闲时，但有时不会。这是断开连接期间 journalctl 的输出：
May 17 15:06:20 archweaponevo kernel: usb 1-1.4: USB disconnect, device number 91
May 17 15:06:20 archweaponevo dbus-daemon[371]: [system] Rejected send message, 0 matched rules; type="method_return", sender=":1.25" (uid=1000 pid=635 comm="/usr/bin/pulseaudio --daemonize=no --log-target=jo") interface="(unset)" member="(unset)" error name="(unset)" requested_reply="0" destination=":1.3" (uid=0 pid=390 comm="/usr/lib/bluetooth/bluetoothd ")
May 17 15:06:20 archweaponevo bluetoothd[390]: Endpoint unregistered: sender=:1.25 path=/MediaEndpoint/A2DPSink/sbc
May 17 15:06:20 archweaponevo bluetoothd[390]: Endpoint unregistered: sender=:1.25 path=/MediaEndpoint/A2DPSource/sbc
May 17 15:06:20 archweaponevo systemd[1]: Starting Load/Save RF Kill Switch Status...
May 17 15:06:20 archweaponevo NetworkManager[372]: <info> [1621281980.8775] device (A0:10:81:38:A2:7D): state change: disconnected -> unmanaged (reason 'removed', sys-iface-state: 'removed')
May 17 15:06:20 archweaponevo systemd[483]: Stopped target Bluetooth.
May 17 15:06:20 archweaponevo systemd[1]: Stopped target Bluetooth.
May 17 15:06:20 archweaponevo systemd[1]: Started Load/Save RF Kill Switch Status.
May 17 15:06:20 archweaponevo audit[1]: SERVICE_START pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=systemd-rfkill comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
May 17 15:06:20 archweaponevo kernel: audit: type=1130 audit(1621281980.880:3435): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=systemd-rfkill comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
May 17 15:06:20 archweaponevo kernel: usb 1-1.4: new full-speed USB device number 92 using ehci-pci
May 17 15:06:21 archweaponevo kernel: usb 1-1.4: New USB device found, idVendor=0a5c, idProduct=21e6, bcdDevice= 1.12
May 17 15:06:21 archweaponevo kernel: usb 1-1.4: New USB device strings: Mfr=1, Product=2, SerialNumber=3
May 17 15:06:21 archweaponevo kernel: usb 1-1.4: Product: BCM20702A0
May 17 15:06:21 archweaponevo kernel: usb 1-1.4: Manufacturer: Broadcom Corp
May 17 15:06:21 archweaponevo kernel: usb 1-1.4: SerialNumber: F4B7E2CCD8D1
May 17 15:06:21 archweaponevo upowerd[650]: treating change event as add on /sys/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.4
May 17 15:06:21 archweaponevo systemd[483]: Reached target Bluetooth.
May 17 15:06:21 archweaponevo systemd[1]: Reached target Bluetooth.
May 17 15:06:21 archweaponevo kernel: Bluetooth: hci0: BCM: chip id 63
May 17 15:06:21 archweaponevo kernel: Bluetooth: hci0: BCM: features 0x07
May 17 15:06:21 archweaponevo kernel: Bluetooth: hci0: archweaponevo
May 17 15:06:21 archweaponevo kernel: Bluetooth: hci0: BCM20702A1 (001.002.014) build 0000
May 17 15:06:21 archweaponevo kernel: Bluetooth: hci0: BCM: firmware Patch file not found, tried:
May 17 15:06:21 archweaponevo kernel: Bluetooth: hci0: BCM: 'brcm/BCM20702A1-0a5c-21e6.hcd'
May 17 15:06:21 archweaponevo kernel: Bluetooth: hci0: BCM: 'brcm/BCM-0a5c-21e6.hcd'
May 17 15:06:21 archweaponevo bluetoothd[390]: Endpoint registered: sender=:1.25 path=/MediaEndpoint/A2DPSink/sbc
May 17 15:06:21 archweaponevo bluetoothd[390]: Endpoint registered: sender=:1.25 path=/MediaEndpoint/A2DPSource/sbc
May 17 15:06:21 archweaponevo NetworkManager[372]: <info> [1621281981.8185] manager: (A0:10:81:38:A2:7D): new Bluetooth device (/org/freedesktop/NetworkManager/Devices/91)
May 17 15:06:21 archweaponevo NetworkManager[372]: <info> [1621281981.8192] device (A0:10:81:38:A2:7D): state change: unmanaged -> unavailable (reason 'managed', sys-iface-state: 'external')
May 17 15:06:21 archweaponevo NetworkManager[372]: <info> [1621281981.8219] device (A0:10:81:38:A2:7D): state change: unavailable -> disconnected (reason 'none', sys-iface-state: 'managed')
May 17 15:06:26 archweaponevo systemd[1]: systemd-rfkill.service: Deactivated successfully.
May 17 15:06:26 archweaponevo audit[1]: SERVICE_STOP pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=systemd-rfkill comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
May 17 15:06:26 archweaponevo kernel: audit: type=1131 audit(1621281986.064:3436): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=systemd-rfkill comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
我可以通过切换“USB 设备 BCM20702A0 [Broadcom Corp] 自动挂起”来使用 Powertop 暂时解决该问题。
运行cat /sys/bus/usb/devices/1-1.4/power/control
确认更改并且蓝牙似乎保持连接。但重启就会重置。
我尝试添加这样的 udev 规则：
/etc/udev/rules.d/usb-power.rules:
ACTION=="add", SUBSYSTEM=="usb", ATTR{idVendor}=="0a5c", ATTR{idProduct}=="21e6", TEST=="power/control", ATTR{power/control}="on"
但这没有效果。