Can't auto config 2 USB serial port

[ccaaatt]

Plug in 2 USB serial, run "lsusb":
...
Bus 004 Device 002: ID 10c4:ea60 Cygnal Integrated Products, Inc. CP210x Composite Device
Bus 005 Device 002: ID 10c4:ea60 Cygnal Integrated Products, Inc. CP210x Composite Device
...
sudo lsusb -v -s :002:

Bus 004 Device 002: ID 10c4:ea60 Cygnal Integrated Products, Inc. CP210x Composite Device
Device Descriptor:
  bLength 18
  bDescriptorType 1
  bcdUSB 1.10
  bDeviceClass 0 (Defined at Interface level)
  bDeviceSubClass 0
  bDeviceProtocol 0
  bMaxPacketSize0 64
  idVendor 0x10c4 Cygnal Integrated Products, Inc.
  idProduct 0xea60 CP210x Composite Device
  bcdDevice 1.00
  iManufacturer 1 Silicon Labs
  iProduct 2 CP2102 USB to UART Bridge Controller
  iSerial 3 0044
  bNumConfigurations 1
  Configuration Descriptor:
    bLength 9
    bDescriptorType 2
    wTotalLength 32
    bNumInterfaces 1
    bConfigurationValue 1
    iConfiguration 0
    bmAttributes 0x80
      (Bus Powered)
    MaxPower 100mA
    Interface Descriptor:
      bLength 9
      bDescriptorType 4
      bInterfaceNumber 0
      bAlternateSetting 0
      bNumEndpoints 2
      bInterfaceClass 255 Vendor Specific Class
      bInterfaceSubClass 0
      bInterfaceProtocol 0
      iInterface 2 CP2102 USB to UART Bridge Controller
      Endpoint Descriptor:
        bLength 7
        bDescriptorType 5
        bEndpointAddress 0x81 EP 1 IN
        bmAttributes 2
          Transfer Type Bulk
          Synch Type None
          Usage Type Data
        wMaxPacketSize 0x0040 1x 64 bytes
        bInterval 0
      Endpoint Descriptor:
        bLength 7
        bDescriptorType 5
        bEndpointAddress 0x01 EP 1 OUT
        bmAttributes 2
          Transfer Type Bulk
          Synch Type None
          Usage Type Data
        wMaxPacketSize 0x0040 1x 64 bytes
        bInterval 0
Device Status: 0x0000
  (Bus Powered)

Bus 005 Device 002: ID 10c4:ea60 Cygnal Integrated Products, Inc. CP210x Composite Device
Device Descriptor:
  bLength 18
  bDescriptorType 1
  bcdUSB 1.10
  bDeviceClass 0 (Defined at Interface level)
  bDeviceSubClass 0
  bDeviceProtocol 0
  bMaxPacketSize0 64
  idVendor 0x10c4 Cygnal Integrated Products, Inc.
  idProduct 0xea60 CP210x Composite Device
  bcdDevice 1.00
  iManufacturer 1 Silicon Labs
  iProduct 2 USB to UART Test version HW1.2
  iSerial 3 0045
  bNumConfigurations 1
  Configuration Descriptor:
    bLength 9
    bDescriptorType 2
    wTotalLength 32
    bNumInterfaces 1
    bConfigurationValue 1
    iConfiguration 0
    bmAttributes 0x80
      (Bus Powered)
    MaxPower 100mA
    Interface Descriptor:
      bLength 9
      bDescriptorType 4
      bInterfaceNumber 0
      bAlternateSetting 0
      bNumEndpoints 2
      bInterfaceClass 255 Vendor Specific Class
      bInterfaceSubClass 0
      bInterfaceProtocol 0
      iInterface 2 USB to UART Test version HW1.2
      Endpoint Descriptor:
        bLength 7
        bDescriptorType 5
        bEndpointAddress 0x81 EP 1 IN
        bmAttributes 2
          Transfer Type Bulk
          Synch Type None
          Usage Type Data
        wMaxPacketSize 0x0040 1x 64 bytes
        bInterval 0
      Endpoint Descriptor:
        bLength 7
        bDescriptorType 5
        bEndpointAddress 0x01 EP 1 OUT
        bmAttributes 2
          Transfer Type Bulk
          Synch Type None
          Usage Type Data
        wMaxPacketSize 0x0040 1x 64 bytes
        bInterval 0
Device Status: 0x0000
  (Bus Powered)

BUT
~$ ls -l /dev/|grep -i usb|grep tty
crw-rw---- 1 root dialout 188, 0 2011-09-27 10:39 ttyUSB0
=================
Just ONE USB tty device was config.
If plug in/out few times, sometime there are not any USB tty device was config( in fact 2 USB serial cable was connected to PC)

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: udev 173-0ubuntu3
ProcVersionSignature: Ubuntu 3.0.0-12.19-generic 3.0.4
Uname: Linux 3.0.0-12-generic i686
ApportVersion: 1.23-0ubuntu1
Architecture: i386
CheckboxSubmission: bb3c63e4987943d4cafafd94eb0f35b5
CheckboxSystem: bb422ca46d02494cdbc459927a98bc2f
CustomUdevRuleFiles: 85-ifupdown.rules 70-wayland.rules
Date: Tue Sep 27 10:48:28 2011
MachineType: LENOVO 77328QC
PccardctlIdent:
 Socket 0:
   no product info available
PccardctlStatus:
 Socket 0:
   no card
ProcEnviron:
 LANGUAGE=en
 PATH=(custom, user)
 LANG=zh_CN.utf8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.0.0-12-generic root=UUID=0aa8ab34-8f88-481b-ab3d-b7b787a481ed ro
SourcePackage: udev
UpgradeStatus: Upgraded to oneiric on 2011-06-02 (116 days ago)
dmi.bios.date: 08/22/2007
dmi.bios.vendor: LENOVO
dmi.bios.version: 7LET51WW (1.21 )
dmi.board.name: 77328QC
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvr7LET51WW(1.21):bd08/22/2007:svnLENOVO:pn77328QC:pvrThinkPadR61:rvnLENOVO:rn77328QC:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 77328QC
dmi.product.version: ThinkPad R61
dmi.sys.vendor: LENOVO

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Hazuki Amamiya (quofei)]

Have you tried the method in here https://bugs.launchpad.net/ubuntu/+source/brltty/+bug/874181 ? That is, uninstall brltty.