[FFADO-user] Firewire Audio Setting RME FF400 into Ubuntu 20.10

[Riccardo W. <ric...@ya...>]

Hey,I am a new user of FFADO, but I think I am dealing with a complicate matter, and I would probably need help.I would like to use a firewire Audio device (RME Fireface 400) with Ubuntu 20.10. My computer doesn't have any native firewire output, so I try to connect it through thunderbolt (from thunderbolt-3 to thunderbolt-2 and then to Firewire with adapters).I try to compile my kernel adding the ieee1394 drivers and all other possible things that may help (adding the CONFIG_SND_FIREFACE). But still when I type
~$ lsmod | grep fireface
I dont get nothing. Instead, when I type
~$ lsmod | grep firewire
I get
firewire_sbp2          24576  0firewire_core          69632  1 firewire_sbp2crc_itu_t              16384  1 firewire_core
But still FFADO does not work:
~$ ffado-mixer &

1606147832947530:  (ffado-dbus-server.cpp)[ 275] main:  Discovering devices...
1606147832950335: Fatal (devicemanager.cpp)[ 187] initialize: No firewire adapters (ports) found.
1606147832950348: Error (ffado-dbus-server.cpp)[ 282] main: Could not initialize device manager
1606147832950354: Debug (ffado-dbus-server.cpp)[ 207] exitfunction: Debug output flushed...no message buffer overruns
16:10:37 logginghandler   ERROR    Could not communicate with the FFADO DBus service...
and When I run lsusb, I apparently see only one dongle:
Bus 001 Device 005: ID 05ac:1657 Apple, Inc. Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter
but I dont know if is a problem of missing drivers or is the connection that does not work (with the use of two adapters). 
Any ideas? many thanks, 
RW