[Bug 80791] "Bluetooth: hci0: ACL packet for unknown connection handle" must be hidden behind "debug"

https://bugzilla.kernel.org/show_bug.cgi?id=80791

Victor Engmark ([email protected]) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |[email protected]

--- Comment #16 from Victor Engmark ([email protected]) ---
Found this issue while looking for a reason why my Bose QC-45s were crackling
during playback.

> kernel: Bluetooth: hci0: ACL packet for unknown connection handle 3837

(Oddly, it's even the same handle number as the two logs other people have
posted above. Is there something special about that?)

`sudo systemctl restart bluetooth` seems to have fixed it.

Running NixOS unstable (26.11, commit ID
2fcb964de67fcf60b43471c55d5d99e61a9ccb5a) with bluez 5.86

Service config:

```
❯ cat
/nix/store/zc356bzkix2dj7l63jpsphi89px6wc2x-system-units/bluetooth.service.d/overrides.conf 
[Unit]

[Service]
Environment="LOCALE_ARCHIVE=/nix/store/dmm8l3wf59027myllvph9b0w5bzdllp8-glibc-locales-2.42-67/lib/locale/locale-archive"
Environment="PATH=/nix/store/di26b1kkbammy0sj70nq5qzvfrh78wxl-coreutils-9.11/bin:/nix/store/fcqbwp5hx5wh3lzf0457wmf0divknz7y-findutils-4.11.0/bin:/nix/store/aak8d9mrdv9sgn0lcg7xss7wxdg9sqh3-gnugrep-3.12/bin:/nix/store/7mfsmbhsd3arnypipwm251rcd0b45riy-gnused-4.10/bin:/nix/store/r6sz8p6sd6c73fp9z8nzl04dri7lyx8n-systemd-261.1/bin:/nix/store/di26b1kkbammy0sj70nq5qzvfrh78wxl-coreutils-9.11/sbin:/nix/store/fcqbwp5hx5wh3lzf0457wmf0divknz7y-findutils-4.11.0/sbin:/nix/store/aak8d9mrdv9sgn0lcg7xss7wxdg9sqh3-gnugrep-3.12/sbin:/nix/store/7mfsmbhsd3arnypipwm251rcd0b45riy-gnused-4.10/sbin:/nix/store/r6sz8p6sd6c73fp9z8nzl04dri7lyx8n-systemd-261.1/sbin"
Environment="TZDIR=/nix/store/2nndxyf3phkb5aggxm3c16sapa0f49kz-tzdata-2026c/share/zoneinfo"
X-RestartIfChanged=false
CapabilityBoundingSet=CAP_NET_BIND_SERVICE
ConfigurationDirectoryMode=0755
ExecStart=
ExecStart=/nix/store/5w050dyskx5si0skc328b0q9mxbn5lmn-bluez-5.86/libexec/bluetooth/bluetoothd
"-f" "/etc/bluetooth/main.conf"
LockPersonality=true
MemoryDenyWriteExecute=true
NoNewPrivileges=true
PrivateNetwork=false
PrivateTmp=true
PrivateUsers=false
ProtectControlGroups=true
ProtectKernelModules=false
ProtectKernelTunables=false
ProtectProc=invisible
RestrictNamespaces=true
RestrictRealtime=true
RestrictSUIDSGID=true
SystemCallArchitectures=native
SystemCallFilter=@system-service

[Install]
WantedBy=bluetooth.target
```

bluez config:

```
❯ cat /etc/bluetooth/main.conf                                                  
[General]
ControllerMode=dual
Privacy=device

[LE]
ConnectionLatency=0
MaxConnectionInterval=9
MinConnectionInterval=7

[Policy]
AutoEnable=true
```

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