I just tested this on 9.10, and was not able to reproduce. The test machine did not have brltty removed (it still appears to be installed by default). I hotplugged two usb to serial devices. The first was not an FTDI, but the second was. Both /dev/ttyUSB0 and /dev/ttyUSB1 appeared and persisted as expected.
I just tested this on 9.10, and was not able to reproduce. The test machine did not have brltty removed (it still appears to be installed by default). I hotplugged two usb to serial devices. The first was not an FTDI, but the second was. Both /dev/ttyUSB0 and /dev/ttyUSB1 appeared and persisted as expected.