[Bug 59386] using /dev/ttyUSB0 in gnome-ppp
ozonehole
taibei at yahoo.com
Thu Mar 22 00:46:30 UTC 2007
Public bug reported:
Binary package hint: gnome-ppp
I recently succeeded in getting Ubuntu to work with an external serial
modem attached to my computer through the USB port. However, this was
difficult to configure and I'm sure a newbie couldn't do it. Yet a
simple change to gnome-ppp would have made it easy. More details
below...
First, to describe my hardware: a notebook computer (IBM ThinkPad X31),
which has no serial ports but has USB ports. I purchased a special cable
which has a built-in adaptor, so that the USB port can be physically
connected to an external serial modem.
The problem is this: the character device required for this set-up to
work is /dev/ttyUSB0. Fortunately, this device does exist in Ubuntu, as
you can see:
bob at x31:/> ls -l /dev/ttyUSB0
crw-rw---- 1 root dialout 188, 0 2006-09-07 09:36 /dev/ttyUSB0
The only trouble is that gnome-ppp does not recognize /dev/ttyUSB0. When
you try to configure it, you are only offered these choices:
/dev/modem
/dev/ttyS0
/dev/ttyS1
/dev/ttyS2
/dev/ttyS3
There is in fact no /dev/modem - it is a symbolic link. For me to make
my hardware work, I had to create a symbolic link:
ln -s /dev/ttyUSB0 /dev/modem
After this, I could configure gnome-ppp to access my modem using
/dev/modem. So it worked - until I rebooted. Thanks to udev, every time
I rebooted my /dev/modem would disappear and I had to create it manually
again. To solve this problem, I created a start-up script (which I named
modem.sh) with this content:
#! /bin/sh
#
ln -s /dev/ttyUSB0 /dev/modem
I placed the script in /etc/init.d and ran this command:
update-rc.d modem.sh defaults
Now I am able to use my modem with gnome-ppp, so my problem is solved.
The only real issue is that all of the above would be nearly impossible
for a Linux newbie to figure out. It occurs to me that this complexity
would be rendered unnecessary if gnome-ppp simply offered /dev/ttyUSB0
as one of its choices. It is my suggestion that this should be done for
the next release.
best regards,
Robert
** Affects: gnome-ppp (Ubuntu)
Importance: Medium
Assignee: MOTU
Status: Confirmed
--
using /dev/ttyUSB0 in gnome-ppp
https://launchpad.net/bugs/59386
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