USB Modem install problem

From: Jean François Ortolo (ortolojf_at_free.fr)
Date: 11/03/05

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To: fedora-list@redhat.com
Date: Thu, 03 Nov 2005 14:45:00 +0100

Hi all
It seems my USB Modem, is detected as USB device ( from
the /var/log/messages file ), but the device interface isn't created.

Here are the config files in my FC4 machine:

/etc/modprobe.conf:

alias eth0 forcedeth
alias scsi_hostadapter sata_nv
alias snd-card-0 snd-intel8x0
options snd-card-0 index=0
options snd-intel8x0 index=0
remove snd-intel8x0 { /usr/sbin/alsactl store 0 >/dev/null 2>&1
|| : ; }; /sbin/modprobe -r --ignore-remove snd-intel8x0
alias usb-controller ehci-hcd
alias usb-controller1 ohci-hcd

I wonder about the reliability of these both last lines.

Here is the /var/log/messages content, relative to the USB detection:

Nov 3 13:06:14 ortolo kernel: ehci_hcd 0000:00:02.1: EHCI Host
Controller
Nov 3 13:06:14 ortolo kernel: ehci_hcd 0000:00:02.1: debug port 1
Nov 3 13:06:14 ortolo kernel: ehci_hcd 0000:00:02.1: new USB bus
registered, assigned bus number 1
Nov 3 13:06:14 ortolo kernel: ehci_hcd 0000:00:02.1: irq 11, io mem
0xfeb00000
Nov 3 13:06:14 ortolo kernel: ehci_hcd 0000:00:02.1: park 0
Nov 3 13:06:14 ortolo kernel: ehci_hcd 0000:00:02.1: USB 2.0
initialized, EHCI 1.00, driver 10 Dec 2004
Nov 3 13:06:14 ortolo kernel: hub 1-0:1.0: USB hub found
Nov 3 13:06:14 ortolo kernel: hub 1-0:1.0: 10 ports detected
Nov 3 13:06:14 ortolo kernel: ACPI: PCI Interrupt Link [LUBA] enabled
at IRQ 3
Nov 3 13:06:14 ortolo kernel: PCI: setting IRQ 3 as level-triggered
Nov 3 13:06:14 ortolo kernel: ACPI: PCI Interrupt 0000:00:02.0[A] ->
Link [LUBA] -> GSI 3 (level, low) -> IRQ 3
Nov 3 13:06:14 ortolo kernel: ohci_hcd 0000:00:02.0: OHCI Host
Controller
Nov 3 13:06:14 ortolo kernel: ohci_hcd 0000:00:02.0: new USB bus
registered, assigned bus number 2
Nov 3 13:06:14 ortolo kernel: ohci_hcd 0000:00:02.0: irq 3, io mem
0xd3004000
Nov 3 13:06:14 ortolo kernel: hub 2-0:1.0: USB hub found
Nov 3 13:06:14 ortolo kernel: hub 2-0:1.0: 10 ports detected
Nov 3 13:06:14 ortolo kernel: usb 2-9: new full speed USB device using
ohci_hcd and address 2
Nov 3 13:06:14 ortolo kernel: ACPI: Power Button (FF) [PWRF]
Nov 3 13:06:14 ortolo kernel: ibm_acpi: ec object not found

Here is the udev rules file content in the /etc/udev/rules.dev/
directory, relative to the USB devices only:

# There are a number of modifiers that are allowed to be used in some of
the
# fields. See the udev man page for a full description of them.
#
# default is OWNER="root" GROUP="root", MODE="0600"
#

# all block devices
SUBSYSTEM=="block", GROUP="disk", MODE="0640"

<...>

# serial+dialup devices
KERNEL=="ttyS*", GROUP="uucp", MODE="0660"
KERNEL=="ippp*", MODE="0660"
KERNEL=="isdn*", MODE="0660"
KERNEL=="isdnctrl*", MODE="0660"
KERNEL=="capi*", MODE="0660"
KERNEL=="dcbri*", MODE="0660"
KERNEL=="ircomm*", GROUP="uucp", MODE="0660"
KERNEL=="ttyUSB*", GROUP="uucp", MODE="0660"
KERNEL=="ttyACM*", GROUP="uucp", MODE="0660"
KERNEL=="tts/[0-9]*", GROUP="uucp", MODE="0660"
KERNEL=="tts/USB[0-9]*", GROUP="uucp", MODE="0660"

<...>

# input devices
KERNEL=="input/*", MODE="0660"

<...>

# usb devices
KERNEL=="usb/dabusb*", GROUP="usb", MODE="0660"
KERNEL=="usb/mdc800*", GROUP="usb", MODE="0660"
KERNEL=="usb/rio500", GROUP="usb", MODE="0660"

<...>

KERNEL=="lp[0-9]*", SYMLINK="par%n"
BUS=="usb", KERNEL=="lp[0-9]*", NAME="usb/%k"

... And here is the /usr/share/doc/MAKEDEV-3.19/devices.txt content,
relative to the USB devices only:

108 char Device independent PPP interface
0 = /dev/ppp Device independent PPP interface

<...>

144 char Encapsulated PPP

                0 = /dev/pppox0 First PPP over Ethernet
                    ...
                63 = /dev/pppox63 64th PPP over Ethernet

This is primarily used for ADSL.

The SST 5136-DN DeviceNet interface driver has been
relocated to major 183 due to an unfortunate conflict.

<...>

166 char ACM USB modems
                  0 = /dev/ttyACM0 First ACM modem
                  1 = /dev/ttyACM1 Second ACM modem
                    ...

167 char ACM USB modems - alternate devices
                  0 = /dev/cuacm0 Callout device for ttyACM0
                  1 = /dev/cuacm1 Callout device for ttyACM1
                    ...

<...>

180 char USB devices
                  0 = /dev/usb/lp0 First USB printer
                    ...
                 15 = /dev/usb/lp15 16th USB printer

    16= /dev/usb/mouse0 First USB mouse
                    ...
                 31 = /dev/usb/mouse15 16th USB mouse
                 32= /dev/usb/ez0 First USB firmware loader
                    ...

                 47= /dev/usb/ez15 16th USB firmware loader
                 48 = /dev/usb/scanner0 First USB scanner
                    ...
                 63 = /dev/usb/scanner15 16th USB scanner
                 64= /dev/usb/rio500 Diamond Rio 500
                 65= /dev/usb/usblcd USBLCD Interface (info@usblcd.de)
                 66= /dev/usb/cpad0 Synaptics cPad (mouse/LCD)

180 block USB block devices
                0 = /dev/uba First USB block device
                8 = /dev/ubb Second USB block device
                16 = /dev/ubc Thrid USB block device
                ...

<...>

188 char USB serial converters
                  0= /dev/ttyUSB0 First USB serial converter
                  1= /dev/ttyUSB1 Second USB serial converter
                    ...

189 char USB serial converters - alternate devices
                  0= /dev/cuusb0 Callout device for ttyUSB0
                  1= /dev/cuusb1 Callout device for ttyUSB1
                    ...

<...>

216 char USB BlueTooth devices
                  0 = /dev/ttyUB0 First USB BlueTooth device
                  1 = /dev/ttyUB1 Second USB BlueTooth device
                    ...

217 char USB BlueTooth devices (alternate devices)
                  0 = /dev/cuub0 Callout device for ttyUB0
                  1 = /dev/cuub1 Callout device for ttyUB1
                    ...

<...>

/dev/modem should not be used for a modem which supports dialin as
well as dialout, as it tends to cause lock file problems. If it
exists, /dev/modem should point to the appropriate primary TTY device
(the use of the alternate callout devices is deprecated).

<...>

Arbitration of serial ports is provided by the use of lock files with
the names /var/lock/LCK..ttyX#. The contents of the lock file should
be the PID of the locking process as an ASCII number.

It is common practice to install links such as /dev/modem
which point to serial ports. In order to ensure proper locking in the
presence of these links, it is recommended that software chase
symlinks and lock all possible names; additionally, it is recommended
that a lock file be installed with the corresponding alternate
device. In order to avoid deadlocks, it is recommended that the locks
are acquired in the following order, and released in the reverse:

        1. The symbolic link name, if any (/var/lock/LCK..modem)
        2. The "tty" name (/var/lock/LCK..ttyS2)
        3. The alternate device name (/var/lock/LCK..cua2)

In the case of nested symbolic links, the lock files should be
installed in the order the symlinks are resolved.

Here is my Problem:

The proper device to be used for this USB ACM compatible modem
( theoretically ACM compatible ), should be: dev/ttyACM0, from a
previous advice I got on this list. But this device is not being
created when the modem is switched.

So my question is: What should I do, for my modem to be accessible as
a device, from my computer ?

Thank you very much for your help.

Best regards.

Jean Francois Ortolo

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