If you’re not sure, just do it it won’t hurt anything. If your system is not using SELinux, this step can be skipped. It's based on the order in which the interface is created by the kernel (notice, no serial devices plugged in, no ttyUSB entries in /dev). Is there a way to force Qt to open /dev/tty0 with echo disabled? Or to disable console output stream to screen buffer?
F /dev/tty0 -echo Solves the problem until application restart. As a result keystrokes are visible on screen buffer.
