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pl2303 Serial/USB problem - /dev/ttyUSB0 not created

Desktop and Laptop both have Debian Testing installed and up to date; both 
with self-compiled kernel 2.6.32.

I have a CurrentCost electricity usage monitor which is normally connected 
to my desktop via USB and is working properly. When the unit is plugged in 
I get a number of lines in syslog like so:

kernel: usb 4-1: new full speed USB device using uhci_hcd and address 12
kernel: pl2303 4-1:1.0: pl2303 converter detected
kernel: usb 4-1: pl2303 converter now attached to ttyUSB0

I am trying to get this same device working on my laptop but this time I 
see the following in syslog:

kernel: pl2303: Prolific PL2303 USB to serial adaptor driver

but nothing else i.e no 'attached to ttyUSB0'. Looking in /dev there is no 

Whereas the desktop also loads the pl2303 and usbserial kernel modules 
automatically when the device is connected the laptop does not and when I 
load them manually I get only the above mentioned line in syslog.

When the USB device is plugged in there is apparently no reaction from the 
operating system on the laptop when watching /var/syslog using 'tail'. 
That, I think, is the main problem. Other USB devices on the laptop do 

Needless to say the software which monitors the device won't connect.

Any suggestions please?

Barry Samuels
The Unofficial Guide to Great Britain

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