I am running the newest version of Mint Linux and I have a Digirig connected between my computer and my Xiegu G90 radio. The Digirig is working fine with FLRIG and WSJTX.
I have a similar setup, Digirig on a LInux Mint 21.1 to Alinco DR-135T.
everything seems to work good when the same setup is running on Window 10, direwolf is reading and sending via com3. when I put that on Linux it can read, but can not send, so I suspect it has something to do with the PTT
following this blog by KT1RUN: I use PTT /dev/ttyUSB0 RTS as well as PTt /dev/tty-digirig RTS
neither create any error when direwolf is started,I can see the send on the screen, but it would not key up the radio.
I used the same conf file except changing the 2 lines, about the sound card and PTT
any advice before giving up and going back to windows.