从Ubuntu Impish转变为Jammy的新问题；蓝牙LE远程配对/连接，但不创建/DEV/INPUT

发布于 2025-02-06 00:38:10 字数 17068 浏览 2 评论 0 原文

我的设备上的Impish和Jammy之间发生了一些事情，而我的小米MITV蓝牙遥控器不再可行。升级到22.04之后，它只是停止创建A /DEV /输入，并且甚至继续工作甚至切换到Mainline内核5.17（Jammy's 5.15.x）也无法使用），并随和一厢情愿，以为显示APT上的每一个更新的更新都会修复它。自从预发行以来，它就一直在那里，此后一直保持不变。

有问题的设备：

我正在使用odroid H2+（基于J4115的x86）运行Ubuntu Mate SBC）作为媒体播放器。蓝牙是通过基于BCM20702A的IOGEAR BT4.0适配器（已安装驱动程序）提供的，但我还尝试了（合法）基于CSR8510的BT4.0适配器，结果相似。

这有点挑剔，但是如果遵循某些步骤，则可以很好地配对，但是与我过去我过去拥有过的每个遥控器和每个电子（Pi Armhf /Odroid Arm64）那样。注意：它是对Ubuntu的Windows，MacOS和iOS以及Jammy版本的配对，可在Ubuntu的jammy pre-jammy版本上使用。

解决杂乱无章以保护无辜的……

遥远的＆amp;来自蓝牙的控制器：

[XiaoMi RC]# info
Device F4:XX:XX:XX:XX:XX (public)
    Name: XiaoMi RC
    Alias: XiaoMi RC
    Appearance: 0x03c0
    Paired: yes
    Trusted: yes
    Blocked: no
    Connected: yes
    WakeAllowed: yes
    LegacyPairing: no
    UUID: Generic Access Profile    (00001800-0000-1000-8000-00805f9b34fb)
    UUID: Generic Attribute Profile (00001801-0000-1000-8000-00805f9b34fb)
    UUID: Immediate Alert           (00001802-0000-1000-8000-00805f9b34fb)
    UUID: Link Loss                 (00001803-0000-1000-8000-00805f9b34fb)
    UUID: Tx Power                  (00001804-0000-1000-8000-00805f9b34fb)
    UUID: Device Information        (0000180a-0000-1000-8000-00805f9b34fb)
    UUID: Battery Service           (0000180f-0000-1000-8000-00805f9b34fb)
    UUID: Human Interface Device    (00001812-0000-1000-8000-00805f9b34fb)
    UUID: Scan Parameters           (00001813-0000-1000-8000-00805f9b34fb)
    Modalias: bluetooth:v2717p3200d0110
    Battery Percentage: 0x47 (71)
[XiaoMi RC]# show 5C:XX:XX:XX:XX:XX
Controller 5C:XX:XX:XX:XX:XX (public)
    Name: mybox
    Alias: mybox
    Class: 0x00000104
    Powered: yes
    Discoverable: no
    DiscoverableTimeout: 0x000000b4
    Pairable: yes
    UUID: Generic Attribute Profile (00001801-0000-1000-8000-00805f9b34fb)
    UUID: Generic Access Profile    (00001800-0000-1000-8000-00805f9b34fb)
    UUID: PnP Information           (00001200-0000-1000-8000-00805f9b34fb)
    UUID: A/V Remote Control Target (0000110c-0000-1000-8000-00805f9b34fb)
    UUID: A/V Remote Control        (0000110e-0000-1000-8000-00805f9b34fb)
    UUID: Device Information        (0000180a-0000-1000-8000-00805f9b34fb)
    Modalias: usb:v1D6Bp0246d0540
    Discovering: no
    Roles: central
    Roles: peripheral
Advertising Features:
    ActiveInstances: 0x00 (0)
    SupportedInstances: 0x05 (5)
    SupportedIncludes: tx-power
    SupportedIncludes: appearance
    SupportedIncludes: local-name

LSUSB：

Bus 001 Device 005: ID 0a5c:21e8 Broadcom Corp. BCM20702A0 Bluetooth 4.0

BUSCTL：

busctl introspect 'org.bluez' '/org/bluez/hci0/dev_F4_XX_XX_XX_XX_XX'
NAME                                TYPE      SIGNATURE RESULT/VALUE                             FLAGS
org.bluez.Battery1                  interface -         -                                        -
.Percentage                         property  y         71                                       emits-change
org.bluez.Device1                   interface -         -                                        -
.CancelPairing                      method    -         -                                        -
.Connect                            method    -         -                                        -
.ConnectProfile                     method    s         -                                        -
.Disconnect                         method    -         -                                        -
.DisconnectProfile                  method    s         -                                        -
.Pair                               method    -         -                                        -
.Adapter                            property  o         "/org/bluez/hci0"                        emits-change
.Address                            property  s         "F4:XX:XX:XX:XX:XX"                      emits-change
.AddressType                        property  s         "public"                                 emits-change
.Alias                              property  s         "XiaoMi RC"                              emits-change writable
.Appearance                         property  q         960                                      emits-change
.Blocked                            property  b         false                                    emits-change writable
.Class                              property  u         -                                        emits-change
.Connected                          property  b         true                                     emits-change
.Icon                               property  s         -                                        emits-change
.LegacyPairing                      property  b         false                                    emits-change
.ManufacturerData                   property  a{qv}     -                                        emits-change
.Modalias                           property  s         "bluetooth:v2717p3200d0110"              emits-change
.Name                               property  s         "XiaoMi RC"                              emits-change
.Paired                             property  b         true                                     emits-change
.RSSI                               property  n         -                                        emits-change
.ServiceData                        property  a{sv}     -                                        emits-change
.ServicesResolved                   property  b         true                                     emits-change
.Trusted                            property  b         true                                     emits-change writable
.TxPower                            property  n         -                                        emits-change
.UUIDs                              property  as        9 "00001800-0000-1000-8000-00805f9b34fb… emits-change
.WakeAllowed                        property  b         true                                     emits-change writable
org.freedesktop.DBus.Introspectable interface -         -                                        -
.Introspect                         method    -         s                                        -
org.freedesktop.DBus.Properties     interface -         -                                        -
.Get                                method    ss        v                                        -
.GetAll                             method    s         a{sv}                                    -
.Set                                method    ssv       -                                        -
.PropertiesChanged                  signal    sa{sv}as  -

Syslog中的一些奇怪消息，但没有什么能尖叫“ Major Fail”：

:~$ cat /var/log/syslog | grep "Blue"
Apr  5 22:50:24 mybox systemd[1]: Starting Bluetooth management mechanism...
Apr  5 22:50:24 mybox kernel: [    7.337177] Bluetooth: Core ver 2.22
Apr  5 22:50:24 mybox kernel: [    7.337217] Bluetooth: HCI device and connection manager initialized
Apr  5 22:50:24 mybox kernel: [    7.337222] Bluetooth: HCI socket layer initialized
Apr  5 22:50:24 mybox kernel: [    7.337227] Bluetooth: L2CAP socket layer initialized
Apr  5 22:50:24 mybox kernel: [    7.337234] Bluetooth: SCO socket layer initialized
Apr  5 22:50:24 mybox kernel: [    7.575381] Bluetooth: hci0: BCM: chip id 63
Apr  5 22:50:24 mybox kernel: [    7.576384] Bluetooth: hci0: BCM: features 0x07
Apr  5 22:50:24 mybox kernel: [    7.592401] Bluetooth: hci0: BCM20702A
Apr  5 22:50:24 mybox kernel: [    7.592411] Bluetooth: hci0: BCM20702A1 (001.002.014) build 0000
Apr  5 22:50:24 mybox kernel: [    7.594649] Bluetooth: hci0: BCM20702A1 'brcm/BCM20702A1-0a5c-21e8.hcd' Patch
Apr  5 22:50:24 mybox kernel: [    8.196379] Bluetooth: hci0: unexpected event 0xff length: 2 > 0
Apr  5 22:50:24 mybox systemd[1]: Started Bluetooth management mechanism.
Apr  5 22:50:24 mybox kernel: [    8.518390] Bluetooth: hci0: Broadcom Bluetooth Device
Apr  5 22:50:24 mybox kernel: [    8.518400] Bluetooth: hci0: BCM20702A1 (001.002.014) build 1764
Apr  5 22:50:24 mybox systemd[1]: Starting Bluetooth service...
Apr  5 22:50:24 mybox bluetoothd[970]: Bluetooth daemon 5.64
Apr  5 22:50:24 mybox systemd[1]: Started Bluetooth service.
Apr  5 22:50:24 mybox NetworkManager[699]: <info>  [1649213424.6320] Loaded device plugin: NMBluezManager (/usr/lib/x86_64-linux-gnu/NetworkManager/1.36.4/libnm-device-plugin-bluetooth.so)
Apr  5 22:50:24 mybox systemd[1]: Reached target Bluetooth Support.
Apr  5 22:50:24 mybox kernel: [    8.948829] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
Apr  5 22:50:24 mybox kernel: [    8.948837] Bluetooth: BNEP filters: protocol multicast
Apr  5 22:50:24 mybox kernel: [    8.948843] Bluetooth: BNEP socket layer initialized
Apr  5 22:50:24 mybox bluetoothd[970]: Bluetooth management interface 1.21 initialized
Apr  5 22:50:36 mybox kernel: [   20.341197] Bluetooth: RFCOMM TTY layer initialized
Apr  5 22:50:36 mybox kernel: [   20.341222] Bluetooth: RFCOMM socket layer initialized
Apr  5 22:50:36 mybox kernel: [   20.341233] Bluetooth: RFCOMM ver 1.11
Apr  5 22:56:28 mybox systemd[1777]: Reached target Bluetooth.
Apr  5 23:17:03 mybox systemd[1777]: Starting Bluetooth Manager...
Apr  5 23:17:03 mybox systemd[1777]: Started Bluetooth Manager.
Apr  5 23:17:25 mybox kernel: [ 1630.329450] Bluetooth: hci0: unexpected SMP command 0x0b from f4:xx:xx:xx:xx:xx
Apr  5 23:17:52 mybox blueman-manager[115657]: blueman.bluez.errors.BluezDBusException: org.freedesktop.DBus.Error.InvalidArgs No such interface 'org.bluez.Battery1'
Apr  6 06:21:33 mybox NetworkManager[660748]: <info>  [1649240493.3391] Loaded device plugin: NMBluezManager (/usr/lib/x86_64-linux-gnu/NetworkManager/1.36.4/libnm-device-plugin-bluetooth.so)

远程对和连接。我显然可以看到它蓝牙。但是在/dev/输入中没有创建任何事件：

me@mybox:~$ sudo evtest
No device specified, trying to scan all of /dev/input/event*
Available devices:
/dev/input/event0:    Power Button
/dev/input/event1:    Power Button
/dev/input/event2:    Video Bus
/dev/input/event3:    Logitech K400 Plus
/dev/input/event4:    Microsoft X-Box 360 pad
/dev/input/event5:    Microsoft X-Box 360 pad
/dev/input/event6:    Microsoft X-Box 360 pad
/dev/input/event7:    Pulse-Eight CEC Adapter
/dev/input/event8:    Microsoft X-Box 360 pad
/dev/input/event9:    HDA Intel PCH Mic
/dev/input/event10:    HDA Intel PCH Headphone
/dev/input/event11:    HDA Intel PCH HDMI/DP,pcm=3
/dev/input/event12:    HDA Intel PCH HDMI/DP,pcm=7
/dev/input/event13:    HDA Intel PCH HDMI/DP,pcm=8
/dev/input/event14:    HDA Intel PCH HDMI/DP,pcm=9
/dev/input/event15:    HDA Intel PCH HDMI/DP,pcm=10
Select the device event number [0-15]:

showkey和xev没有关键点，但是btmon正在看到它们：

me@mybox:~$ sudo btmon
Bluetooth monitor ver 5.64
= Note: Linux version 5.17.1-051701-generic (x86_64)                                                           0.026997
= Note: Bluetooth subsystem version 2.22                                                                       0.027002
= New Index: 5C:XX:XX:XX:XX:XX (Primary,USB,hci0)                                                       [hci0] 0.027004
= Open Index: 5C:XX:XX:XX:XX:XX                                                                        [hci0] 0.027004
= Index Info: 5C:XX:XX:XX:XX:XX (Broadcom Corporation)                                                  [hci0] 0.027005
@ MGMT Open: bluetoothd (privileged) version 1.21                                                     {0x0001} 0.027006
> ACL Data RX: Handle 64 flags 0x02 dlen 15                                                          #1 [hci0] 1.698718
      ATT: Handle Value Notification (0x1b) len 10
        Handle: 0x0032
          Data: 0000510000000000
> ACL Data RX: Handle 64 flags 0x02 dlen 15                                                          #2 [hci0] 1.774350
      ATT: Handle Value Notification (0x1b) len 10
        Handle: 0x0032
          Data: 0000000000000000
> ACL Data RX: Handle 64 flags 0x02 dlen 15                                                          #3 [hci0] 2.594360
      ATT: Handle Value Notification (0x1b) len 10
        Handle: 0x0032
          Data: 0000520000000000
> ACL Data RX: Handle 64 flags 0x02 dlen 15                                                          #4 [hci0] 2.754407
      ATT: Handle Value Notification (0x1b) len 10
        Handle: 0x0032
          Data: 0000000000000000
> ACL Data RX: Handle 64 flags 0x02 dlen 15                                                          #5 [hci0] 3.414342
      ATT: Handle Value Notification (0x1b) len 10
        Handle: 0x0032
          Data: 0000500000000000
> ACL Data RX: Handle 64 flags 0x02 dlen 15                                                          #6 [hci0] 3.574341
      ATT: Handle Value Notification (0x1b) len 10
        Handle: 0x0032
          Data: 0000000000000000
> ACL Data RX: Handle 64 flags 0x02 dlen 15                                                          #7 [hci0] 4.014365
      ATT: Handle Value Notification (0x1b) len 10
        Handle: 0x0032
          Data: 00004f0000000000
> ACL Data RX: Handle 64 flags 0x02 dlen 15                                                          #8 [hci0] 4.174358
      ATT: Handle Value Notification (0x1b) len 10
        Handle: 0x0032
          Data: 0000000000000000
> ACL Data RX: Handle 64 flags 0x02 dlen 15                                                          #9 [hci0] 4.674365
      ATT: Handle Value Notification (0x1b) len 10
        Handle: 0x0032
          Data: 0000660000000000
> ACL Data RX: Handle 64 flags 0x02 dlen 15                                                         #10 [hci0] 4.934380
      ATT: Handle Value Notification (0x1b) len 10
        Handle: 0x0032
          Data: 0000000000000000
> ACL Data RX: Handle 64 flags 0x02 dlen 15                                                         #11 [hci0] 5.794429
      ATT: Handle Value Notification (0x1b) len 10
        Handle: 0x0032
          Data: 0000800000000000
> ACL Data RX: Handle 64 flags 0x02 dlen 15                                                         #12 [hci0] 6.034380
      ATT: Handle Value Notification (0x1b) len 10
        Handle: 0x0032
          Data: 0000000000000000
> ACL Data RX: Handle 64 flags 0x02 dlen 15                                                         #13 [hci0] 7.194396
      ATT: Handle Value Notification (0x1b) len 10
        Handle: 0x0032
          Data: 0000810000000000
> ACL Data RX: Handle 64 flags 0x02 dlen 15                                                         #14 [hci0] 7.354432
      ATT: Handle Value Notification (0x1b) len 10
        Handle: 0x0032
          Data: 0000000000000000
> ACL Data RX: Handle 64 flags 0x02 dlen 15                                                         #15 [hci0] 8.454406
      ATT: Handle Value Notification (0x1b) len 10
        Handle: 0x0032
          Data: 00004a0000000000
> ACL Data RX: Handle 64 flags 0x02 dlen 15                                                         #16 [hci0] 8.694405
      ATT: Handle Value Notification (0x1b) len 10
        Handle: 0x0032
          Data: 0000000000000000
> ACL Data RX: Handle 64 flags 0x02 dlen 15                                                        #17 [hci0] 10.414431
      ATT: Handle Value Notification (0x1b) len 10
        Handle: 0x0032
          Data: 0000650000000000
> ACL Data RX: Handle 64 flags 0x02 dlen 15                                                        #18 [hci0] 10.654417
      ATT: Handle Value Notification (0x1b) len 10
        Handle: 0x0032
          Data: 0000000000000000
> ACL Data RX: Handle 64 flags 0x02 dlen 15                                                        #19 [hci0] 11.134410
      ATT: Handle Value Notification (0x1b) len 10
        Handle: 0x0032
          Data: 0000f10000000000
> ACL Data RX: Handle 64 flags 0x02 dlen 15                                                        #20 [hci0] 11.294427
      ATT: Handle Value Notification (0x1b) len 10
        Handle: 0x0032
          Data: 0000000000000000
> ACL Data RX: Handle 64 flags 0x02 dlen 15                                                        #21 [hci0] 12.094482
      ATT: Handle Value Notification (0x1b) len 10
        Handle: 0x0032
          Data: 0000280000000000
> ACL Data RX: Handle 64 flags 0x02 dlen 15                                                        #22 [hci0] 12.234598
      ATT: Handle Value Notification (0x1b) len 10
        Handle: 0x0032
          Data: 0000000000000000

这驱动了我 nuts 。特别是因为使用AAA电池而不是硬币电池电池的另一个相似遥控器的类似模型（一个定期断开连接，并且重新连接速度很慢，但是配对良好，可以创建一个输入事件，并且识别所有键盘）。

原文

Something happened between Impish and Jammy on my device, and my Xiaomi MiTV bluetooth remote control no longer works. After upgrading to 22.04, it just stopped creating a /dev/input, and has continued not working even switching to mainline kernel 5.17 (Jammy's 5.15.x doesn't work either) and the wishful thinking that every update on apt that shows up will fix it. It's been there since the pre-release and has remained ever since.

Device in question:
https://xiaomi-mi.ca/accessories-tv-box/xiaomi-mi-tv-mi-tv-box-bluetooth-remote-control/

I'm running Ubuntu Mate on an Odroid H2+ (j4115-based x86 SBC) as a media player. Bluetooth has been supplied via a BCM20702A-based IOGear BT4.0 adapter (driver installed), but I've also tried a (legit) CSR8510-based BT4.0 adapter with similar results.

It's a bit finicky, but pairs fine if certain steps are followed—but it's been that way with this remote and every ELEC I've had in the past that I've had in the past (PI ArmHF /Odroid ARM64). Note: It pairs and is usable on Windows, MacOS and iOS and pre-Jammy versions of Ubuntu.

Addresses obfuscated to protect the innocent…

REMOTE & CONTROLLER from bluetoothctl:

[XiaoMi RC]# info
Device F4:XX:XX:XX:XX:XX (public)
    Name: XiaoMi RC
    Alias: XiaoMi RC
    Appearance: 0x03c0
    Paired: yes
    Trusted: yes
    Blocked: no
    Connected: yes
    WakeAllowed: yes
    LegacyPairing: no
    UUID: Generic Access Profile    (00001800-0000-1000-8000-00805f9b34fb)
    UUID: Generic Attribute Profile (00001801-0000-1000-8000-00805f9b34fb)
    UUID: Immediate Alert           (00001802-0000-1000-8000-00805f9b34fb)
    UUID: Link Loss                 (00001803-0000-1000-8000-00805f9b34fb)
    UUID: Tx Power                  (00001804-0000-1000-8000-00805f9b34fb)
    UUID: Device Information        (0000180a-0000-1000-8000-00805f9b34fb)
    UUID: Battery Service           (0000180f-0000-1000-8000-00805f9b34fb)
    UUID: Human Interface Device    (00001812-0000-1000-8000-00805f9b34fb)
    UUID: Scan Parameters           (00001813-0000-1000-8000-00805f9b34fb)
    Modalias: bluetooth:v2717p3200d0110
    Battery Percentage: 0x47 (71)
[XiaoMi RC]# show 5C:XX:XX:XX:XX:XX
Controller 5C:XX:XX:XX:XX:XX (public)
    Name: mybox
    Alias: mybox
    Class: 0x00000104
    Powered: yes
    Discoverable: no
    DiscoverableTimeout: 0x000000b4
    Pairable: yes
    UUID: Generic Attribute Profile (00001801-0000-1000-8000-00805f9b34fb)
    UUID: Generic Access Profile    (00001800-0000-1000-8000-00805f9b34fb)
    UUID: PnP Information           (00001200-0000-1000-8000-00805f9b34fb)
    UUID: A/V Remote Control Target (0000110c-0000-1000-8000-00805f9b34fb)
    UUID: A/V Remote Control        (0000110e-0000-1000-8000-00805f9b34fb)
    UUID: Device Information        (0000180a-0000-1000-8000-00805f9b34fb)
    Modalias: usb:v1D6Bp0246d0540
    Discovering: no
    Roles: central
    Roles: peripheral
Advertising Features:
    ActiveInstances: 0x00 (0)
    SupportedInstances: 0x05 (5)
    SupportedIncludes: tx-power
    SupportedIncludes: appearance
    SupportedIncludes: local-name

LSUSB:

Bus 001 Device 005: ID 0a5c:21e8 Broadcom Corp. BCM20702A0 Bluetooth 4.0

busctl:

busctl introspect 'org.bluez' '/org/bluez/hci0/dev_F4_XX_XX_XX_XX_XX'
NAME                                TYPE      SIGNATURE RESULT/VALUE                             FLAGS
org.bluez.Battery1                  interface -         -                                        -
.Percentage                         property  y         71                                       emits-change
org.bluez.Device1                   interface -         -                                        -
.CancelPairing                      method    -         -                                        -
.Connect                            method    -         -                                        -
.ConnectProfile                     method    s         -                                        -
.Disconnect                         method    -         -                                        -
.DisconnectProfile                  method    s         -                                        -
.Pair                               method    -         -                                        -
.Adapter                            property  o         "/org/bluez/hci0"                        emits-change
.Address                            property  s         "F4:XX:XX:XX:XX:XX"                      emits-change
.AddressType                        property  s         "public"                                 emits-change
.Alias                              property  s         "XiaoMi RC"                              emits-change writable
.Appearance                         property  q         960                                      emits-change
.Blocked                            property  b         false                                    emits-change writable
.Class                              property  u         -                                        emits-change
.Connected                          property  b         true                                     emits-change
.Icon                               property  s         -                                        emits-change
.LegacyPairing                      property  b         false                                    emits-change
.ManufacturerData                   property  a{qv}     -                                        emits-change
.Modalias                           property  s         "bluetooth:v2717p3200d0110"              emits-change
.Name                               property  s         "XiaoMi RC"                              emits-change
.Paired                             property  b         true                                     emits-change
.RSSI                               property  n         -                                        emits-change
.ServiceData                        property  a{sv}     -                                        emits-change
.ServicesResolved                   property  b         true                                     emits-change
.Trusted                            property  b         true                                     emits-change writable
.TxPower                            property  n         -                                        emits-change
.UUIDs                              property  as        9 "00001800-0000-1000-8000-00805f9b34fb… emits-change
.WakeAllowed                        property  b         true                                     emits-change writable
org.freedesktop.DBus.Introspectable interface -         -                                        -
.Introspect                         method    -         s                                        -
org.freedesktop.DBus.Properties     interface -         -                                        -
.Get                                method    ss        v                                        -
.GetAll                             method    s         a{sv}                                    -
.Set                                method    ssv       -                                        -
.PropertiesChanged                  signal    sa{sv}as  -

a few odd messages in syslog, but nothing that screams "major fail":

:~$ cat /var/log/syslog | grep "Blue"
Apr  5 22:50:24 mybox systemd[1]: Starting Bluetooth management mechanism...
Apr  5 22:50:24 mybox kernel: [    7.337177] Bluetooth: Core ver 2.22
Apr  5 22:50:24 mybox kernel: [    7.337217] Bluetooth: HCI device and connection manager initialized
Apr  5 22:50:24 mybox kernel: [    7.337222] Bluetooth: HCI socket layer initialized
Apr  5 22:50:24 mybox kernel: [    7.337227] Bluetooth: L2CAP socket layer initialized
Apr  5 22:50:24 mybox kernel: [    7.337234] Bluetooth: SCO socket layer initialized
Apr  5 22:50:24 mybox kernel: [    7.575381] Bluetooth: hci0: BCM: chip id 63
Apr  5 22:50:24 mybox kernel: [    7.576384] Bluetooth: hci0: BCM: features 0x07
Apr  5 22:50:24 mybox kernel: [    7.592401] Bluetooth: hci0: BCM20702A
Apr  5 22:50:24 mybox kernel: [    7.592411] Bluetooth: hci0: BCM20702A1 (001.002.014) build 0000
Apr  5 22:50:24 mybox kernel: [    7.594649] Bluetooth: hci0: BCM20702A1 'brcm/BCM20702A1-0a5c-21e8.hcd' Patch
Apr  5 22:50:24 mybox kernel: [    8.196379] Bluetooth: hci0: unexpected event 0xff length: 2 > 0
Apr  5 22:50:24 mybox systemd[1]: Started Bluetooth management mechanism.
Apr  5 22:50:24 mybox kernel: [    8.518390] Bluetooth: hci0: Broadcom Bluetooth Device
Apr  5 22:50:24 mybox kernel: [    8.518400] Bluetooth: hci0: BCM20702A1 (001.002.014) build 1764
Apr  5 22:50:24 mybox systemd[1]: Starting Bluetooth service...
Apr  5 22:50:24 mybox bluetoothd[970]: Bluetooth daemon 5.64
Apr  5 22:50:24 mybox systemd[1]: Started Bluetooth service.
Apr  5 22:50:24 mybox NetworkManager[699]: <info>  [1649213424.6320] Loaded device plugin: NMBluezManager (/usr/lib/x86_64-linux-gnu/NetworkManager/1.36.4/libnm-device-plugin-bluetooth.so)
Apr  5 22:50:24 mybox systemd[1]: Reached target Bluetooth Support.
Apr  5 22:50:24 mybox kernel: [    8.948829] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
Apr  5 22:50:24 mybox kernel: [    8.948837] Bluetooth: BNEP filters: protocol multicast
Apr  5 22:50:24 mybox kernel: [    8.948843] Bluetooth: BNEP socket layer initialized
Apr  5 22:50:24 mybox bluetoothd[970]: Bluetooth management interface 1.21 initialized
Apr  5 22:50:36 mybox kernel: [   20.341197] Bluetooth: RFCOMM TTY layer initialized
Apr  5 22:50:36 mybox kernel: [   20.341222] Bluetooth: RFCOMM socket layer initialized
Apr  5 22:50:36 mybox kernel: [   20.341233] Bluetooth: RFCOMM ver 1.11
Apr  5 22:56:28 mybox systemd[1777]: Reached target Bluetooth.
Apr  5 23:17:03 mybox systemd[1777]: Starting Bluetooth Manager...
Apr  5 23:17:03 mybox systemd[1777]: Started Bluetooth Manager.
Apr  5 23:17:25 mybox kernel: [ 1630.329450] Bluetooth: hci0: unexpected SMP command 0x0b from f4:xx:xx:xx:xx:xx
Apr  5 23:17:52 mybox blueman-manager[115657]: blueman.bluez.errors.BluezDBusException: org.freedesktop.DBus.Error.InvalidArgs No such interface 'org.bluez.Battery1'
Apr  6 06:21:33 mybox NetworkManager[660748]: <info>  [1649240493.3391] Loaded device plugin: NMBluezManager (/usr/lib/x86_64-linux-gnu/NetworkManager/1.36.4/libnm-device-plugin-bluetooth.so)

The remote pairs and connects. I can obviously see it bluetoothctl. But no event is created in /dev/input:

me@mybox:~$ sudo evtest
No device specified, trying to scan all of /dev/input/event*
Available devices:
/dev/input/event0:    Power Button
/dev/input/event1:    Power Button
/dev/input/event2:    Video Bus
/dev/input/event3:    Logitech K400 Plus
/dev/input/event4:    Microsoft X-Box 360 pad
/dev/input/event5:    Microsoft X-Box 360 pad
/dev/input/event6:    Microsoft X-Box 360 pad
/dev/input/event7:    Pulse-Eight CEC Adapter
/dev/input/event8:    Microsoft X-Box 360 pad
/dev/input/event9:    HDA Intel PCH Mic
/dev/input/event10:    HDA Intel PCH Headphone
/dev/input/event11:    HDA Intel PCH HDMI/DP,pcm=3
/dev/input/event12:    HDA Intel PCH HDMI/DP,pcm=7
/dev/input/event13:    HDA Intel PCH HDMI/DP,pcm=8
/dev/input/event14:    HDA Intel PCH HDMI/DP,pcm=9
/dev/input/event15:    HDA Intel PCH HDMI/DP,pcm=10
Select the device event number [0-15]:

showkey and xev gets no keypresses, but btmon is seeing them:

me@mybox:~$ sudo btmon
Bluetooth monitor ver 5.64
= Note: Linux version 5.17.1-051701-generic (x86_64)                                                           0.026997
= Note: Bluetooth subsystem version 2.22                                                                       0.027002
= New Index: 5C:XX:XX:XX:XX:XX (Primary,USB,hci0)                                                       [hci0] 0.027004
= Open Index: 5C:XX:XX:XX:XX:XX                                                                        [hci0] 0.027004
= Index Info: 5C:XX:XX:XX:XX:XX (Broadcom Corporation)                                                  [hci0] 0.027005
@ MGMT Open: bluetoothd (privileged) version 1.21                                                     {0x0001} 0.027006
> ACL Data RX: Handle 64 flags 0x02 dlen 15                                                          #1 [hci0] 1.698718
      ATT: Handle Value Notification (0x1b) len 10
        Handle: 0x0032
          Data: 0000510000000000
> ACL Data RX: Handle 64 flags 0x02 dlen 15                                                          #2 [hci0] 1.774350
      ATT: Handle Value Notification (0x1b) len 10
        Handle: 0x0032
          Data: 0000000000000000
> ACL Data RX: Handle 64 flags 0x02 dlen 15                                                          #3 [hci0] 2.594360
      ATT: Handle Value Notification (0x1b) len 10
        Handle: 0x0032
          Data: 0000520000000000
> ACL Data RX: Handle 64 flags 0x02 dlen 15                                                          #4 [hci0] 2.754407
      ATT: Handle Value Notification (0x1b) len 10
        Handle: 0x0032
          Data: 0000000000000000
> ACL Data RX: Handle 64 flags 0x02 dlen 15                                                          #5 [hci0] 3.414342
      ATT: Handle Value Notification (0x1b) len 10
        Handle: 0x0032
          Data: 0000500000000000
> ACL Data RX: Handle 64 flags 0x02 dlen 15                                                          #6 [hci0] 3.574341
      ATT: Handle Value Notification (0x1b) len 10
        Handle: 0x0032
          Data: 0000000000000000
> ACL Data RX: Handle 64 flags 0x02 dlen 15                                                          #7 [hci0] 4.014365
      ATT: Handle Value Notification (0x1b) len 10
        Handle: 0x0032
          Data: 00004f0000000000
> ACL Data RX: Handle 64 flags 0x02 dlen 15                                                          #8 [hci0] 4.174358
      ATT: Handle Value Notification (0x1b) len 10
        Handle: 0x0032
          Data: 0000000000000000
> ACL Data RX: Handle 64 flags 0x02 dlen 15                                                          #9 [hci0] 4.674365
      ATT: Handle Value Notification (0x1b) len 10
        Handle: 0x0032
          Data: 0000660000000000
> ACL Data RX: Handle 64 flags 0x02 dlen 15                                                         #10 [hci0] 4.934380
      ATT: Handle Value Notification (0x1b) len 10
        Handle: 0x0032
          Data: 0000000000000000
> ACL Data RX: Handle 64 flags 0x02 dlen 15                                                         #11 [hci0] 5.794429
      ATT: Handle Value Notification (0x1b) len 10
        Handle: 0x0032
          Data: 0000800000000000
> ACL Data RX: Handle 64 flags 0x02 dlen 15                                                         #12 [hci0] 6.034380
      ATT: Handle Value Notification (0x1b) len 10
        Handle: 0x0032
          Data: 0000000000000000
> ACL Data RX: Handle 64 flags 0x02 dlen 15                                                         #13 [hci0] 7.194396
      ATT: Handle Value Notification (0x1b) len 10
        Handle: 0x0032
          Data: 0000810000000000
> ACL Data RX: Handle 64 flags 0x02 dlen 15                                                         #14 [hci0] 7.354432
      ATT: Handle Value Notification (0x1b) len 10
        Handle: 0x0032
          Data: 0000000000000000
> ACL Data RX: Handle 64 flags 0x02 dlen 15                                                         #15 [hci0] 8.454406
      ATT: Handle Value Notification (0x1b) len 10
        Handle: 0x0032
          Data: 00004a0000000000
> ACL Data RX: Handle 64 flags 0x02 dlen 15                                                         #16 [hci0] 8.694405
      ATT: Handle Value Notification (0x1b) len 10
        Handle: 0x0032
          Data: 0000000000000000
> ACL Data RX: Handle 64 flags 0x02 dlen 15                                                        #17 [hci0] 10.414431
      ATT: Handle Value Notification (0x1b) len 10
        Handle: 0x0032
          Data: 0000650000000000
> ACL Data RX: Handle 64 flags 0x02 dlen 15                                                        #18 [hci0] 10.654417
      ATT: Handle Value Notification (0x1b) len 10
        Handle: 0x0032
          Data: 0000000000000000
> ACL Data RX: Handle 64 flags 0x02 dlen 15                                                        #19 [hci0] 11.134410
      ATT: Handle Value Notification (0x1b) len 10
        Handle: 0x0032
          Data: 0000f10000000000
> ACL Data RX: Handle 64 flags 0x02 dlen 15                                                        #20 [hci0] 11.294427
      ATT: Handle Value Notification (0x1b) len 10
        Handle: 0x0032
          Data: 0000000000000000
> ACL Data RX: Handle 64 flags 0x02 dlen 15                                                        #21 [hci0] 12.094482
      ATT: Handle Value Notification (0x1b) len 10
        Handle: 0x0032
          Data: 0000280000000000
> ACL Data RX: Handle 64 flags 0x02 dlen 15                                                        #22 [hci0] 12.234598
      ATT: Handle Value Notification (0x1b) len 10
        Handle: 0x0032
          Data: 0000000000000000

This is driving me nuts. Especially because another similar model of the same remote that uses AAA batteries instead of a coin-cell battery works (that one disconnects regularly, and is slow to reconnect however, but pairs fine, creates an input event and all keypresses are recognized).