Bjrn- Thank you for your response. This change gets me closer. I can now successfully execute the modprobe without error, but the device still doesn't show up in /dev/ttyUSB? . sja@UBUNTU-10:~$ sudo modprobe usbserial vendor=0x0c6a product=0x0005 sja@UBUNTU-10:~$ lsusb Bus 005 Device 004: ID 0c6a:0005 Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 002 Device 003: ID 045e:0048 Microsoft Corp. Office Keyboard 1.0A Bus 002 Device 002: ID 0557:7000 ATEN International Co., Ltd Hub Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub I guess it's still not happy about something... Steven J. Ackerman, Consultant ACS, Sarasota, FL http://www.acscontrol.com mailto:steve@xxxxxxxxxxxxxx > -----Original Message----- > From: Bjørn Mork [mailto:bjorn@xxxxxxx] > Sent: Monday, September 17, 2012 4:08 PM > To: Steven J. Ackerman > Cc: linux-usb@xxxxxxxxxxxxxxx; linux-serial@xxxxxxxxxxxxxxx > Subject: Re: Linux USB Serial > > "Steven J. Ackerman" <steve@xxxxxxxxxxxxxx> writes: > > > Interface Descriptor: > > bLength 9 > > bDescriptorType 4 > > bInterfaceNumber 0 > > bAlternateSetting 0 > > bNumEndpoints 1 > > bInterfaceClass 2 Communications > > bInterfaceSubClass 32 > > Looks like your bInterfaceSubClass is nibble swapped. It should be 0x02 > for ACM, not 0x20. > > > Bjrn -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html