On Wed, Apr 14, 2010 at 04:21:01PM +0200, Andrea Cometa wrote:
quoted text
> Greg KH ha scritto:
>> On Tue, Apr 13, 2010 at 07:40:24PM +0200, Andrea Cometa wrote:
>>   
>>> Hi,
>>> First of all I apologize for my poor knowledge of English ...
>>>
>>> I'm having problems with a USB serial adapter Prolific PL2303.
>>> My Linux distribution is Ubuntu 9.10 with kernel 2.6.31-20.
>>> the adapter is recognized and the file ttyUSB0 is also created.
>>> But the serial device receives and sends no reply.
>>> On the Internet I found some information concerning the possibility that 
>>> this adapter is a pl2303x instead pl2303, as the command lsusb shows the 
>>> value of "bmaxpacketsize0 64".
>>> Have any ideas about how to fix this problem?
>>>     
>>
>> The "x" device should work with the latest driver, can you try out a
>> newer kernel version?  The 2.6.31 kernel was known to have problems with
>> the pl2303 and other tty drivers.
>>
>> thanks,
>>
>> greg k-h
>>
>>
>>   
> hi,
>
> i've installed kernel 2.6.34-rc2 but there was no change
> there may be an old working kernel?

Hm, what kind of messages do you get from the kernel log when you plug a
device in and then start sending/receiving data through it?

Also, are you sure you have the flow control set up properly?  That
always tripps me up :)

thanks,

greg k-h
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