蓝牙鼠标无法连接，连接后频繁断开且报错Host is down的问题求助

各位好，我遇到了一个棘手的蓝牙鼠标连接问题——昨天还能正常工作的鼠标，今天突然完全没法用了，折腾了好几种操作都没解决，想请大家帮忙看看问题出在哪。

操作过程与bluetoothctl输出 #

我先在bluetoothctl里尝试配对、信任、连接设备，具体输出如下：

[bluetooth]# pair 11:21:EC:00:00:02
Attempting to pair with 11:21:EC:00:00:02
Failed to pair: org.bluez.Error.AlreadyExists

[bluetooth]# trust 11:21:EC:00:00:02
Changing 11:21:EC:00:00:02 trust succeeded

[bluetooth]# connect 11:21:EC:00:00:02
Attempting to connect to 11:21:EC:00:00:02
[CHG] Device 11:21:EC:00:00:02 Connected: yes
Failed to connect: org.bluez.Error.Failed br-connection-create-socket
[CHG] Device 11:21:EC:00:00:02 Connected: no

之后我反复开关鼠标（保持bluetoothctl运行），发现设备会反复连接又立刻断开：

[CHG] Device 11:21:EC:00:00:02 Connected: yes
[CHG] Device 11:21:EC:00:00:02 Connected: no
[CHG] Device 11:21:EC:00:00:02 Connected: yes
[CHG] Device 11:21:EC:00:00:02 Connected: no
[CHG] Device 11:21:EC:00:00:02 Connected: yes
[CHG] Device 11:21:EC:00:00:02 Connected: no
[CHG] Device 11:21:EC:00:00:02 Connected: yes
[CHG] Device 11:21:EC:00:00:02 Connected: no
[bluetooth]#

syslog日志信息 #

当我手动执行connect命令时，查看syslog发现了这些错误：

Sep 26 10:15:53 vivobook-linux bluetoothd[7134]: profiles/input/device.c:ioctl_is_connected() Can't get HIDP connection info
Sep 26 10:15:59 vivobook-linux bluetoothd[7134]: profiles/input/device.c:control_connect_cb() connect to 11:21:EC:00:00:02: Host is down (112)

这里提示“Host is down”，但实际上我的鼠标是开机状态的，并没有断电。我也尝试过把鼠标切换到配对模式，但依然没有任何改善。

btmon捕获的日志 #

最后我用btmon捕获了蓝牙交互日志，输出如下：

$ sudo btmon -w pair.bts
Bluetooth monitor ver 5.64
= Note: Linux version 6.2.0-33-generic (x86_64)                                                                                                                    0.286424
= Note: Bluetooth subsystem version 2.22                                                                                                                           0.286427
= New Index: AC:12:03:3C:0C:CA (Primary,USB,hci0)                                                                                                           [hci0] 0.286430
= Open Index: AC:12:03:3C:0C:CA                                                                                                                             [hci0] 0.286431
= Index Info: AC:12:03:3C:0C:CA (Intel Corp.)                                                                                                               [hci0] 0.286434
@ MGMT Open: bluetoothd (privileged) version 1.22                                                                                                         {0x0001} 0.286436
= bluetoothd: profiles/input/device.c:ioctl_is_connected() Can't get HIDP connection info                                                                         20.303463
< HCI Command: Create Connection (0x01|0x0005) plen 13                                                                                                  #1 [hci0] 20.303511
Address: 11:21:EC:00:00:02 (OUI 11-21-EC)
Packet type: 0xcc18
DM1 may be used
DH1 may be used
DM3 may be used
DH3 may be used
DM5 may be used
DH5 may be used
Page scan repetition mode: R2 (0x02)
Page scan mode: Mandatory (0x00)
Clock offset: 0x0000
Role switch: Allow peripheral (0x01)
> HCI Event: Command Status (0x0f) plen 4                                                                                                               #2 [hci0] 20.428572
Create Connection (0x01|0x0005) ncmd 1
Status: Success (0x00)
> HCI Event: Connect Complete (0x03) plen 11                                                                                                            #3 [hci0] 25.645679
Status: Page Timeout (0x04)
Handle: 65535
Address: 11:21:EC:00:00:02 (OUI 11-21-EC)
Link type: ACL (0x01)
Encryption: Disabled (0x00)
@ MGMT Event: Connect Failed (0x000d) plen 8                                                                                                      {0x0001} [hci0] 25.645771
BR/EDR Address: 11:21:EC:00:00:02 (OUI 11-21-EC)
Status: Connect Failed (0x04)
= bluetoothd: profiles/input/device.c:control_connect_cb() connect to 11:21:EC:00:00:02: Host is down (112)                                                       25.646297

有没有朋友遇到过类似的情况？或者能从这些日志里看出问题所在？麻烦帮忙支支招，谢谢大家！

备注：内容来源于stack exchange，提问作者nagylzs