Modem hangup

Hello,
I've successfully installed the driver, the modem is recognized, my
connection is properly configured...

But every 3 minutes the modem hangs up and I've to reboot to get a
connection again.

/var/log/messages :

Mar 18 13:42:13 nestor kernel: Conexant: RX FIFO OVERRUN (Bus Latency) -
FIFOE<3>
Mar 18 13:42:13 nestor kernel: Conexant: TX FIFO UNDERRUN (Bus Latency) -
FIFOE<3>
Mar 18 13:43:26 nestor pppd[2625]: Modem hangup

I've got a full license.

System : fc5 with latest kernel (2.6.20-1.2300.fc5), xorg with nvidia (not
nv)

Laptop : dell inspiron 8200
Modem :  Intel Corporation 82801CA/CAM AC'97 Modem Controller (rev 02)

.wvdial.conf :
Modem = /dev/ttySHSF0
ISDN = off
Modem Type = Analog Modem
Baud = 57600
Init = ATZ
Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
...
Dial Command = ATM1L3DT

Of course, the modem works OK with XP and it worked beautifully with older
free driver on redhat 9.

Since July, I've tried different kernels - stk 16 because 4 stks crashed my
system, it doesn't now with latest release.

The hangup occurs whether with  kpp or gnome-ppp/wvdia

/etc/modprobe.conf :

install snd-via82xx-modem /bin/true # temporarily disabled by hsf -
conflicts with hsfmc97via
install snd-intel8x0m /bin/true # temporarily disabled by hsf - conflicts
with hsfmc97ich hsfmc97sis
install snd-atiixp-modem /bin/true # temporarily disabled by hsf - conflicts
with hsfmc97ati
alias /dev/ttySHSF[0-9]* /dev/ttySHSF
alias /dev/modem /dev/ttySHSF
alias char-major-240 /dev/ttySHSF
alias char-major-240-* /dev/ttySHSF
options hsfserial serialmajor=240
alias char-major-242 hsfosspec
alias char-major-242-* hsfosspec
alias /dev/hsfdiag hsfosspec
alias /dev/hsfdiag* /dev/hsfdiag
alias char-major-243 /dev/hsfdiag
alias char-major-243-* /dev/hsfdiag
options hsfosspec dcpmajor=242 diagmajor=243
install /dev/ttySHSF /sbin/modprobe hsfpcibasic2; /sbin/modprobe hsfmc97ich;
/sbin/modprobe hsfmc97via; /sbin/modprobe hsfmc97ali; /sbin/modprobe
hsfmc97ati; /sbin/modprobe hsfmc97sis; [ -e /lib/modules/`uname
-r`/extra/hsfusbcd2.ko ] && /sbin/modprobe hsfusbcd2; /sbin/modprobe
snd_hda_intel; /bin/true
alias symbol:cnxthwhda_probe hsfhda
alias symbol:cnxthwhda_resume hsfhda
alias symbol:cnxthwhda_suspend hsfhda

Any hints ?

Thanks.

Laurent Moineau

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