Hi, I have a 4-port Vscom adaptor. When using it I get errors where some of the /dev/tts/USBx devices seem to get disconnected, then be connected again on a different device. eg. /dev/tts/USB2 and USB3 will be involved in some transfer, then will move to /dev/tts/USB4 and USB5. The other ports stay on the same devices, and I'm not touching the hardware cables or psu. The logs are full of errors like:
drivers/usb/serial/ftdi_sio.c: ftdi_tiocmget Could not get modem status of device - err: -19 (or -71). Is there any way to stop this and make the serial ports always appear on the same device paths? Sample of log follows: Nov 10 13:28:30 funky drivers/usb/serial/ftdi_sio.c: ftdi_tiocmget Could not get modem status of device - err: -71 Nov 10 13:28:30 funky drivers/usb/serial/ftdi_sio.c: ftdi_tiocmget Could not get modem status of device - err: -71 Nov 10 13:28:30 funky drivers/usb/serial/ftdi_sio.c: ftdi_tiocmget Could not get modem status of device - err: -71 Nov 10 13:28:30 funky drivers/usb/serial/ftdi_sio.c: ftdi_tiocmget Could not get modem status of device - err: -71 Nov 10 13:28:30 funky hub 2-0:1.0: port 1 disabled by hub (EMI?), re-enabling... Nov 10 13:28:30 funky usb 2-1: USB disconnect, address 2 Nov 10 13:28:30 funky usb 2-1.1: USB disconnect, address 3 Nov 10 13:28:30 funky ftdi_sio ttyUSB0: FTDI USB Serial Device converter now disconnected from ttyUSB0 Nov 10 13:28:30 funky ftdi_sio 2-1.1:1.0: device disconnected Nov 10 13:28:30 funky usb 2-1.2: USB disconnect, address 4 Nov 10 13:28:30 funky ftdi_sio ttyUSB1: FTDI USB Serial Device converter now disconnected from ttyUSB1 Nov 10 13:28:30 funky ftdi_sio 2-1.2:1.0: device disconnected Nov 10 13:28:30 funky usb 2-1.3: USB disconnect, address 5 Nov 10 13:28:30 funky ftdi_sio 2-1.3:1.0: device disconnected Nov 10 13:28:30 funky usb 2-1.4: USB disconnect, address 7 Nov 10 13:28:30 funky ftdi_sio ttyUSB4: FTDI USB Serial Device converter now disconnected from ttyUSB4 Nov 10 13:28:30 funky ftdi_sio 2-1.4:1.0: device disconnected Nov 10 13:28:30 funky drivers/usb/serial/ftdi_sio.c: ftdi_tiocmget Could not get modem status of device - err: -71 Nov 10 13:28:30 funky usb 2-1: new full speed USB device using uhci_hcd and address 8 Nov 10 13:28:30 funky hub 2-1:1.0: USB hub found Nov 10 13:28:30 funky hub 2-1:1.0: 4 ports detected Nov 10 13:28:30 funky usb 2-1.1: new full speed USB device using uhci_hcd and address 9 Nov 10 13:28:30 funky ftdi_sio 2-1.1:1.0: FTDI USB Serial Device converter detected Nov 10 13:28:30 funky drivers/usb/serial/ftdi_sio.c: Detected FT232BM Nov 10 13:28:30 funky usb 2-1.1: FTDI USB Serial Device converter now attached to ttyUSB0 Nov 10 13:28:30 funky usb 2-1.2: new full speed USB device using uhci_hcd and address 10 Nov 10 13:28:31 funky ftdi_sio 2-1.2:1.0: FTDI USB Serial Device converter detected Nov 10 13:28:31 funky drivers/usb/serial/ftdi_sio.c: Detected FT232BM Nov 10 13:28:31 funky usb 2-1.2: FTDI USB Serial Device converter now attached to ttyUSB1 Nov 10 13:28:31 funky usb 2-1.3: new full speed USB device using uhci_hcd and address 11 Nov 10 13:28:31 funky ftdi_sio 2-1.3:1.0: FTDI USB Serial Device converter detected Nov 10 13:28:31 funky drivers/usb/serial/ftdi_sio.c: Detected FT232BM Nov 10 13:28:31 funky usb 2-1.3: FTDI USB Serial Device converter now attached to ttyUSB4 Nov 10 13:28:31 funky usb 2-1.4: new full speed USB device using uhci_hcd and address 12 Nov 10 13:28:31 funky ftdi_sio 2-1.4:1.0: FTDI USB Serial Device converter detected Nov 10 13:28:31 funky drivers/usb/serial/ftdi_sio.c: Detected FT232BM Nov 10 13:28:31 funky usb 2-1.4: FTDI USB Serial Device converter now attached to ttyUSB5 Nov 10 13:29:11 funky ftdi_sio ttyUSB2: FTDI USB Serial Device converter now disconnected from ttyUSB2 Nov 10 13:29:11 funky ftdi_sio ttyUSB3: FTDI USB Serial Device converter now disconnected from ttyUSB3 ------------------------------------------------------- SF.Net email is sponsored by: Tame your development challenges with Apache's Geronimo App Server. Download it for free - -and be entered to win a 42" plasma tv or your very own Sony(tm)PSP. Click here to play: http://sourceforge.net/geronimo.php _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
