Hello
This bug seems to still exist in Debian 9.8 "Stretch". I actually do not own any hardware using the cp210X kernel module, I am just forwarding this information here.
Output from lsusb command: Bus 006 Device 002: ID 10c4:ea60 Cygnal Integrated Products, Inc. CP210x UART Bridge / myAVR mySmartUSB light Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Output from logs: Mar 31 07:23:57 debian kernel: [ 6221.612063] usb 6-2: new full-speed USB device number 2 using uhci_hcd Mar 31 07:23:57 debian kernel: [ 6221.791082] usb 6-2: New USB device found, idVendor=10c4, idProduct=ea60 Mar 31 07:23:57 debian kernel: [ 6221.791086] usb 6-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 Mar 31 07:23:57 debian kernel: [ 6221.791088] usb 6-2: Product: CP2102 USB to UART Bridge Controller Mar 31 07:23:57 debian kernel: [ 6221.791090] usb 6-2: Manufacturer: Silicon Labs Mar 31 07:23:57 debian kernel: [ 6221.791092] usb 6-2: SerialNumber: 0001 Mar 31 07:23:57 debian mtp-probe: checking bus 6, device 2: "/sys/devices/pci0000:00/0000:00:1d.0/usb6/6-2" Mar 31 07:23:57 debian mtp-probe: bus: 6, device: 2 was not an MTP device Mar 31 07:23:57 debian kernel: [ 6221.869563] usbcore: registered new interface driver usbserial Mar 31 07:23:57 debian kernel: [ 6221.869586] usbcore: registered new interface driver usbserial_generic Mar 31 07:23:57 debian kernel: [ 6221.869607] usbserial: USB Serial support registered for generic Mar 31 07:23:57 debian kernel: [ 6221.892149] usbcore: registered new interface driver cp210x Mar 31 07:23:57 debian kernel: [ 6221.892173] usbserial: USB Serial support registered for cp210x Mar 31 07:23:57 debian kernel: [ 6221.892225] cp210x 6-2:1.0: cp210x converter detected Mar 31 07:23:57 debian kernel: [ 6221.898200] usb 6-2: cp210x converter now attached to ttyUSB0 Mar 31 07:24:01 debian brltty[430]: USB configuration set error 16: Laite tai resurssi varattu. Mar 31 07:24:01 debian brltty[430]: brltty: USB configuration set error 16: Laite tai resurssi varattu. Mar 31 07:24:01 debian kernel: [ 6225.530058] usb 6-2: usbfs: interface 0 claimed by cp210x while 'brltty' sets config #1 Mar 31 07:24:01 debian brltty[430]: brltty: USB interface in use: 0 (cp210x) Mar 31 07:24:01 debian brltty[430]: USB interface in use: 0 (cp210x) Mar 31 07:24:01 debian kernel: [ 6225.532412] cp210x ttyUSB0: cp210x converter now disconnected from ttyUSB0 Mar 31 07:24:01 debian kernel: [ 6225.532431] cp210x 6-2:1.0: device disconnected Mar 31 07:24:01 debian brltty[430]: Ignored Byte: 00 Mar 31 07:24:01 debian brltty[430]: brltty: Ignored Byte: 00 AFAIK the version of brltty in use is 5.4-7 which is the current brltty in Debian Stretch. Any idea if brltty 5.6 or later fixes this problem? Thanks in advance. Regards Mika
