I am able to try linux kernel 2.6.36-rc6, 2.6.35.7, and the result is
the same as 2.6.35
$ sudo lsusb -v
Bus 006 Device 003: ID 0711:0230 Magic Control Technology Corp.
MCT-232 Serial Port
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.10
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 16
idVendor 0x0711 Magic Control Technology Corp.
idProduct 0x0230 MCT-232 Serial Port
bcdDevice 1.03
iManufacturer 1 USB-RS232 Interface Converter
iProduct 2 USB Ver1.2 Device
iSerial 3 129029
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 39
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xa0
(Bus Powered)
Remote Wakeup
MaxPower 50mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 3
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 255 Vendor Specific Subclass
bInterfaceProtocol 255 Vendor Specific Protocol
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0002 1x 2 bytes
bInterval 2
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 1
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x02 EP 2 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0010 1x 16 bytes
bInterval 1
Device Status: 0x0000
(Bus Powered)
On Wed, Oct 20, 2010 at 8:59 AM, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote:
> On Wed, 20 Oct 2010, Eric Shattow "Eprecocious" wrote:
>
>> I have a purple "U232-P9(2.4)" USB to Serial adapter. The distributor
>> I bought it from made a big deal about the purple color distinguishing
>> this from other similar adapters.
>>
>> This adapter works with kernel 2.6.34.7 and breaks with kernel 2.6.35,
>> both mainline for Ubuntu from:
>> http://kernel.ubuntu.com/~kernel-ppa/mainline/
>>
>> Steps to reproduce the issue:
>>
>> $ uname -r
>> 2.6.35-020635-generic
>>
>> $ sudo modprobe usbserial debug=1
>> $ sudo modprobe mct_u232 debug=1
>
> ...
>
>> Having trouble to find which patch introduced this issue, and what the
>> problem is exactly. It looks like there are so many updates to USB
>> from 2.6.34 into 2.6.35 that I'm beyond my reach.
>
> What is the output from "lsusb -v" for your adapter?
>
> Alan Stern
>
>
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