[Bug 249089] Intel AC-9560 Bluetooth errors on Apple Powerbeats Pro

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=249089

            Bug ID: 249089
           Summary: Intel AC-9560 Bluetooth errors on Apple Powerbeats Pro
           Product: Base System
           Version: Unspecified
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: neel at neelc.org

When I try to use my Apple Powerbeats Pro on my HP Spectre x360 13-ap0053dx
with the respective Intel AC-9560 bluetooth.

I get errors like this:
ng_l2cap_process_echo_rsp: ubt0l2cap - unexpected L2CAP_EchoRsp command.
Requested ident does not exist, ident=7
ng_l2cap_process_echo_rsp: ubt0l2cap - unexpected L2CAP_EchoRsp command.
Requested ident does not exist, ident=1
ng_l2cap_process_echo_rsp: ubt0l2cap - unexpected L2CAP_EchoRsp command.
Requested ident does not exist, ident=2
ng_l2cap_process_cfg_rsp: ubt0l2cap - unexpected L2CAP_ConfigRsp. Invalid
channel state, scid=397, state=5
ng_l2cap_process_cfg_req: ubt0l2cap - unexpected L2CAP_ConfigReq. Invalid
channel state, cid=397, state=5
ng_l2cap_l2ca_discon_req: ubt0l2cap - unexpected L2CA_Disconnect request
message. Channel does not exist, lcid=0
ng_l2cap_l2ca_discon_req: ubt0l2cap - unexpected L2CA_Disconnect request
message. Channel does not exist, lcid=0
ng_l2cap_process_echo_rsp: ubt0l2cap - unexpected L2CAP_EchoRsp command.
Requested ident does not exist, ident=2
ng_l2cap_process_echo_rsp: ubt0l2cap - unexpected L2CAP_EchoRsp command.
Requested ident does not exist, ident=3

l2ping works, but I am not able to connect via virtual_oss:

backend_bt: PSM=0x19
backend_bt: Could not connect to HC: 5

I also can't use l2control -a MAC read_(channel/connection)_list, they give
"network is down" errors.

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