Bug#721763: brltty grabs tty from CP2102/CP2109 device disconnecting default

[Mika Hanhijärvi]

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