Bug 39238

Description of Problem:
External USB modem (3Com ISDN Pro TA) fails to work correctly with
2.4.2 kernel (upgrade of Wolverine - Seawolf). Has worked fine for 
months with 2.2.xx. I've re-installed 2.2.17-14 and it works fine.
What seems to happen is 'CONNECT 128000' response is not received
from modem, the subsequent PPP negotiation is, but WvDial is still
looking for the Carrier connection line.

I've dropped down into minicom on /dev/usb/ttySACM0 and manually 
dialling I see the same effect, PPP wibble straight after my ATDT string.
On 2.2.17-14 this works fine every time (I get <LF> CONNECT 128000 <LF>
PPP wibble). 


How Reproducible:
Completely. About 5% success with 2.4.2, 100% with 2.2.17-14.
I've also tried two other ISP's - just in case of simultaneous
meddling when I did my upgrade :-)


Steps to Reproduce:
1. ifup ppp0 or minicom -o ATDT08440416672
2. 
3. 

Actual Results: 
May  6 00:59:08 mouth WvDial: Modem initialized. 
May  6 00:59:08 mouth WvDial: Sending: ATDT 08440416672 
May  6 00:59:08 mouth WvDial: Waiting for carrier. 
May  6 00:59:08 mouth WvDial: ATDT 08440416672 
May  6 00:59:26 mouth WvDial: ~[7f]}#@!}!} } }2}!}$}%\}#}$@#}"}&} } } }
NM~~[7f]}#@!}!}!} }2}!}$}%\}#}$@#}"}&} } } } A]~~[7f]}#@!}!}"}
}2}!}$}%\}#}$@#}"}&} } } } Pm~~[7f]}#@!}!}#} }2}!}$}%\}#}$@#}"}&} } } }
_}~~[7f]}#@!}!}$} }2}!}$}%\}#}$@#}"}&} } } } r 
May  6 01:00:18 mouth WvDial: ~~[7f]}#@!}!}%} }2}!}$}%\}#}$@#}"}&} } } }
}][1d]~~[7f]}#@!}!}&} }2}!}$}%\}#}$@#}"}&} } } } l-~~[7f]}#@!}!}'}
}2}!}$}%\}#}$@#}"}&} } } } c=~~[7f]}#@!}!}(} }2}!}$}%\}#}$@#}"}&} } } }
6M~~[7f]}#@!}!})} }2}!}$}%\}#}$@#}"}&} } } } 9]~~[7f]}#@!}!}*}
}2}!}$}%\}#}$@#}"}&} } } } (m~ 
May  6 01:00:18 mouth WvDial: NO CARRIER 
May  6 01:00:18 mouth WvDial: No Carrier!  Trying again. 
May  6 01:00:21 mouth WvDial: Sending: ATDT 08440416672 


Expected Results:
May  6 01:03:44 mouth WvDial: Modem initialized. 
May  6 01:03:44 mouth WvDial: Sending: ATDT 08440416672 
May  6 01:03:44 mouth WvDial: Waiting for carrier. 
May  6 01:03:44 mouth WvDial: ATDT 08440416672 
May  6 01:03:46 mouth WvDial: CONNECT 128000 
May  6 01:03:46 mouth WvDial: Carrier detected.  Waiting for prompt. 
May  6 01:03:46 mouth WvDial: ~[7f]}#@!}!} } }2}!}$}%\}#}$@#}"}&} } } } NM~ 
May  6 01:03:46 mouth WvDial: PPP negotiation detected. 
May  6 01:03:46 mouth pppd[905]: Serial connection established.
May  6 01:03:46 mouth pppd[905]: Using interface ppp0
May  6 01:03:46 mouth pppd[905]: Connect: ppp0 <--> /dev/usb/ttyACM0
May  6 01:03:50 mouth kernel: PPP BSD Compression module registered
May  6 01:03:51 mouth kernel: PPP Deflate Compression module registered





Additional Information:
Celeron 500 MHz, 196MB RAM

May  6 00:47:15 mouth kernel: usb.c: registered new driver usbdevfs
May  6 00:47:15 mouth kernel: usb.c: registered new driver hub
May  6 00:47:15 mouth kernel: usb-uhci.c: $Revision: 1.251 $ time 20:53:29
Apr  8 2001
May  6 00:47:15 mouth kernel: usb-uhci.c: Highbandwidth mode enabled
May  6 00:47:15 mouth kernel: PCI: Found IRQ 11 for device 00:07.2
May  6 00:47:15 mouth kernel: usb-uhci.c: USB UHCI at I/O 0xe000, IRQ 11
May  6 00:47:15 mouth kernel: usb-uhci.c: Detected 2 ports
May  6 00:47:15 mouth kernel: usb.c: new USB bus registered, assigned bus
number 1
May  6 00:47:15 mouth kernel: hub.c: USB hub found
May  6 00:47:15 mouth kernel: hub.c: 2 ports detected
May  6 00:47:15 mouth kernel: hub.c: USB new device connect on bus1/1,
assigned device number 2
May  6 00:47:15 mouth kernel: usb.c: registered new driver acm
May  6 00:47:15 mouth kernel: ttyACM0: USB ACM device
May  6 00:47:15 mouth kernel: hub.c: USB new device connect on bus1/2,
assigned device number 3
May  6 00:47:16 mouth kernel: hub.c: USB hub found
May  6 00:47:16 mouth kernel: hub.c: 5 ports detected