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Thanks a lot for Your help!!!
Lorenzo
 Only plain text email is forwarded by the  Discuss@xxxxxxxxxxxxx List Server,
 as HTML can contain viruses. Use as the email Subject Line:
           YourName, YourCountry  kernel 2.6.15-23-amd64-generic 
 With this Subject Line cogent experts will be alerted, and useful case names left in the Archive.
 YourCountry will enable Country specific guidance. Linux experts in YourCountry 
 can be found through: http://www.linux.org/groups/index.html.
They will know your Country's modem code, which may be essential for dialup service.
Responses from Discuss@xxxxxxxxxxxxx are sometimes blocked by an Internet Provider mail filters.
 So in a day, also check the Archived responses at http://www.linmodems.org 
--------------------------  System information ----------------------------
CPU=x86_64,  
Linux version 2.6.15-23-amd64-generic (buildd@yellow) (gcc version 4.0.3 (Ubuntu 4.0.3-1ubuntu5)) #1 SMP PREEMPT Tue May 23 13:45:47 UTC 2006
 scanModem update of:  2008_06_21


Some modem drivers can only be used in 32 bit modem on x86_64 systems,
while some others are competent on x86_64 Systems.  Cases are:
1) http://linmodems.technion.ac.il/bigarch/archive-seventh/msg03119.html 
for the snd-hda-intel audio+modem driver. Also applicable to AC97 modem controllers.
In both cases, 32 bit libraries must be installed to support the slmodemd helper having a precompiled 32 bit component.
2) For USB modems using the slusb.ko driver. 32 bit libraries must be installed to support the slmodemd helper having a precompiled 32 bit component
3) The hsfmodem and hcflinmodem drivers for Conexant chipsest modes are x86_64 competent.

 There are no blacklisted modem drivers in /etc/modprobe*  files 
Attached USB devices are:
 ID 2008:2018  

USB modems not recognized

For candidate card in slot 0000:00:14.6, firmware information and bootup diagnostics are:
 PCI slot	PCI ID		SubsystemID	Name
 ----------	---------	---------	--------------
 0000:00:14.6	1002:4378	103c:3085	Modem: ATI Technologies Inc ATI SB400 - AC'97 Modem Controller 

 Modem interrupt assignment and sharing: 
209:        682   IO-APIC-level  ATI IXP Modem, ATI IXP
 --- Bootup diagnostics for card in PCI slot 0000:00:14.6 ----
[   18.654719] ACPI: PCI Interrupt 0000:00:14.6[B] -> GSI 17 (level, low) -> IRQ 209
[   18.654728] ACPI: PCI interrupt for device 0000:00:14.6 disabled
[   37.744426] ACPI: PCI Interrupt 0000:00:14.6[B] -> GSI 17 (level, low) -> IRQ 209

 The PCI slot 0000:00:14.6 of the modem card may be disabled early in 
 a bootup process,  but then enabled later. If modem drivers load 
 but the  modem is not responsive, read DOCs/Bootup.txt about possible fixes.
 Send dmesg.txt along with ModemData.txt to discuss@xxxxxxxxxxxxx
 if help is needed.
 


===== Advanced Linux Sound Architecture (ALSA) diagnostics ===== 
The ALSA packages provide audio support and also drivers for some modems.
ALSA diagnostics are written during bootup to /proc/asound/ folders.

The ALSA verion is 1.0.10
The modem cards detected by "aplay -l"  are: 
card 1: Modem [ATI IXP Modem], device 0: ATI IXP MC97 [ATI IXP MC97]

The /proc/asound/pcm file reports:
-----------------------
00-00: ATI IXP AC97 : ATI IXP AC97 : playback 1 : capture 1
01-00: ATI IXP MC97 : ATI IXP MC97 : playback 1 : capture 1

about /proc/asound/cards:
------------------------
0 [IXP            ]: ATIIXP - ATI IXP
                     ATI IXP rev 1 with unknown codec at 0xb0003400, irq 209
1 [Modem          ]: ATIIXP-MODEM - ATI IXP Modem
                     ATI IXP Modem rev 1 at 0xb0003800, irq 209
=== Finished firmware and bootup diagnostics, next deducing cogent software. ===

Predictive diagnostics for card in bus 0000:00:14.6:
	Modem chipset  detected on
NAME="Modem: ATI Technologies Inc ATI SB400 - AC'97 Modem Controller "
CLASS=0703
PCIDEV=1002:4378
SUBSYS=103c:3085
IRQ=209
SOFT=1002:4378.MC97
CodecArchived=CXT
CodecClass=CXT
IDENT=hsfmodem
Driver=hsfmodem_drivers

 For candidate modem in:  0000:00:14.6
   0703 Modem: ATI Technologies Inc ATI SB400 - AC'97 Modem Controller 
      Primary device ID:  1002:4378
    Subsystem PCI_id  103c:3085 
    Softmodem codec or chipset from diagnostics: 
                               from    Archives: CXT, a Conexant type using hsfmodem software.
      CXTnn is  a generic for all CXTnumbers, with  Linuxant hsfmodem software support.                  
      

Support type needed or chipset:	hsfmodem


For owners of a Dell PCs with Conexant HSF modems, a driver source package with full speed enabled is available, but requires driver compiling. Read DOCs/Conexant.txt

 From  http://www.linuxant.com/drivers/hsf/full/downloads-ubuntu-x86.php
 download hsfmodem-7.68.00.07full_k2.6.15_23_amd64_generic_ubuntu_i386.deb.zip 
 Under Linux unpack with:
 $ unzip hsfmodem*.zip
 Then install with:
 $ sudo dpkg -i hsfmodem*.deb
 Subsequently, the modem should be found with
 $ sudo wvdialconf /etc/wvdial.conf
 Edit in your personal information with:
 $ sudo gedit /etc/wvdial.conf
 and try dialing out with:
 $ sudo wvdial.
 See DOCs/Testing.txt  for details.
 
 Read DOCs/Conexant.txt

Writing DOCs/Conexant.txt


 Completed candidate modem analyses.

 The base of the UDEV device file system is: /dev/.udev

 The kernel was compiled with gcc version 4.0.3 and a compiler is not installed


If compiling a modem driver proves to be necessary, one of the two procedures must be followed.
If not yet on the Internet, put the Dapper install CD in the drive
Open a terminal and therein:
$ sudo apt-get install  gcc-4.0  make
Additionally the package linux-headers-2.6.15-23-amd64-generic must be downloaded.  
Go to http://packages.ubuntu.com/  and search for linux-headers-2.6.15-23-amd64-generic 
After downloading, it can be installed with:
$ sudo dpkg -i linux-header*.deb

Or alternatively if online through Ethernet do:
$ sudo apt-get update
$ sudo apt-get install build-essential
will do all the necessary installations mentioned above.

In either installation case, set a symbolic link which will be expected later:
$ sudo ln -s /usr/bin/gcc-4.0  /usr/bin/gcc
After check with:
$ ls -l /usr/bin/gcc*
which should display:
lrwxrwxrwx 1 root root    16 2006-07-09 21:53 /usr/bin/gcc -> /usr/bin/gcc-4.0
-rwxr-xr-x 1 root root 93584 2006-04-20 18:22 /usr/bin/gcc-4.0
-rwxr-xr-x 1 root root 16245 2006-04-20 18:13 /usr/bin/gccbug-4.0

 linux-headers-2.6.15-23-amd64-generic resources needed for compiling are not manifestly ready!

 If compiling is necessary packages must be installed, providing:
	gcc-4.0 make linux-headers-2.6.15-23-amd64-generic


If a driver compilation fails, with message including some lack of some FileName.h (stdio.h for example), then
Some additional kernel-header files need installation to /usr/include. The minimal additional packages are libc6-dev
and any of its dependents, under Ubuntu linux-libc-dev

If an alternate ethernet connection is available,
$  apt-get update
$  apt-get -s install linux-kernel-devel
will install needed packages.
For Debian/Ubuntu related distributions, run the following command to display the needed package list:

Otherwise packages have to be found through http://packages.ubuntu.com
Once downloaded and transferred into a Linux partition,
they can be installed alltogether with:
$ sudo dpkg -i *.deb


Checking pppd properties:
	-rwsr-xr-- 1 root dip 306720 2006-02-23 17:31 /usr/sbin/pppd

In case of an "error 17" "serial loopback" problem, see:
    http://linmodems.technion.ac.il/linmodems/archive-sixth/msg02637.html

To enable dialout without Root permission do:
	$ su - root  (not for Ubuntu)
        sudo chmod a+x /usr/sbin/pppd
or under Ubuntu related Linuxes
	sudo chmod a+x /usr/sbin/pppd

Checking settings of:	/etc/ppp/options
asyncmap 0
auth
crtscts
lock
hide-password
modem
proxyarp
lcp-echo-interval 30
lcp-echo-failure 4
noipx

In case of a message like:
   Warning: Could not modify /etc/ppp/pap-secrets: Permission denied
see http://linmodems.technion.ac.il/bigarch/archive-sixth/msg04656.html


 Don't worry about the following, it is for experts should trouble shooting be necessary.
==========================================================

 Checking for modem support lines:
 --------------------------------------
     /device/modem symbolic link:   
slmodemd created symbolic link /dev/ttySL0:  
     Within /etc/udev/ files:
/etc/udev/rules.d/60-symlinks.rules:# Create /dev/modem symlink
/etc/udev/rules.d/60-symlinks.rules:KERNEL=="ttyLTM[0-9]*",			SYMLINK+="modem"
     Within /etc/modprobe.conf files:
/etc/modprobe.d/alsa-base:options snd-atiixp-modem index=-2
/etc/modprobe.d/alsa-base:options snd-via82xx-modem index=-2
/etc/modprobe.d/blacklist-modem:# Uncomment these entries in order to blacklist unwanted modem drivers
/etc/modprobe.d/blacklist-modem:# blacklist snd-atiixp-modem
/etc/modprobe.d/blacklist-modem:# blacklist snd-via82xx-modem
     Within any ancient /etc/devfs files:

     Within ancient kernel 2.4.n /etc/module.conf files:

--------- end modem support lines --------



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