Re: pl2303 Serial/USB problem - /dev/ttyUSB0 not created
On Fri, 06 Aug 2010 14:02:11 +0100
Barry Samuels <barry@beenthere.mail1.co.uk> wrote:
> 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
> ttyUSBn
>
> 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
> work.
>
> Needless to say the software which monitors the device won't connect.
>
> Any suggestions please?
Are you using the *exact* same kernel on both systems? Do you have the
same problem with a Debian stock kernel? [The first step when
debugging problems with self-compiled kernels is always to check if the
problem exists with stock kernels, or only with one's own.[
Celejar
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