Not only is the (Ubuntu supplied) modem-manager package
inappropriately 'squatting' on device (i.e. /dev/ttyACM0) that it does
*not* recognize as ADSL modems (cuz they often are just ordinary modems
- like my USR Model 5367 or your modem), but, in addition, both GNOME-
PPP (GUI) and wvdial (backend to GNOME-PPP) can *confuse* 'pppd' (i.e.
the point-to-point protocol daemon - whether it does or not depends on
your ISP).
The following SAMBA FAQ revealed this second bug (see
http://ppp.samba.org/ppp/FAQ.html). This second bug can be worked
around by using the 'pon' and 'poff' commands (rather than the wvdial
command). Yes, the good old command line seems like the only thing that
works. Unbuntu's dial-in ISP/modem support seems pretty broken ... but
the underlying software seems to still be in good shape ;-)
------------------------------
Q: When I try to establish a connection, I get an error message
saying "Serial link is not 8-bit clean". Why?
A: The most common cause is that your connection script hasn't
successfully dialled out to the remote system and invoked ppp service
there. Instead, pppd is talking to something (a shell or login process
on the remote machine, or maybe just the modem) which is only outputting
7-bit characters.
This can also arise with a modem which uses an AT command set if the
dial command is issued before pppd is invoked, rather than within a
connect script started by pppd. If the serial port is set to 7
bits/character plus parity when the last AT command is issued, the modem
serial port will be set to the same setting.
Note that pppd *always* sets the local serial port to 8 bits per
character, with no parity and 1 stop bit. So you shouldn't need to issue
an stty command before invoking pppd.
----------------------------
For my part, I am able to begin PPP negotiations with my dial-up
ISP (here in the U.S., named bay area internet solutions) by invoking
pppd either directly (via 'pppd call <foo>') or via the handy 'pon' and
'poff' commands. 'poff -a' (or 'poff <foo>') seems quite adept at
getting pppd shutdown properly. I'd recommend using that.
Unfortunately, I'm still not getting agreement on my static IP address
... so I cannot yet report 100% success. Oh well ...
--
Can't use USB/PL2303-attached Zyxel Omni Mini with non-root user
https://bugs.launchpad.net/bugs/482971
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