Re: System hang (and other problems) with cdc_acm

[Michelle Konzack]

Am 2009-01-25 23:27:53, schrieb Andrew Morton:
> On Mon, 19 Jan 2009 15:20:13 -0500 "Thomas Tuttle" <linux-kernel@xxxxxxxxxxx> wrote:
> 
> > Hi.
> > 
> > I've got a Lenovo X200 with an Ericsson F3507g Mobile Broadband Module
> > (a 3G cellular data card with built-in GPS), which uses the cdc_acm
> > driver.  I've experienced a couple of problems with it.  First, it
> > tends to hang the system after I've been using it for a while.  This
> > occurs whenever it's sending a lot of data to/from the computer,
> > whether it's a PPP connection or a GPS data stream.  I'm not sure how
> > to debug this; the Caps Lock light isn't flashing, so I'm not sure if
> > it's a panic or just a hang.  Second, if I read one of the TTYs using
> > "cat", I get a ton of blank lines.  To make any sense of the data
> > stream, I have to do cat /dev/ttyACM0 | grep -v "^$".
> > 
> > If anyone could help me debug this, I'd be greatly appreciative.

Same problem here...

My Router is based on Debian Etch with

Linux router 2.6.18-6-686 #1 SMP Fri Dec 12 16:48:28 UTC 2008 i686 GNU/Linux

and even if I install 2.6.26 it is the same effect.

I am using a cell-phone "Nokia 6120 classic" and my german GSM  Provider
is O2/Telefonica.  I get without any problems  550 kByte/Sec,  but  then
from one second to another 2-5 kByte/Sec.

I have to use

1)  poff o2
2)  wait for termination
3)  disconnect the Nokia
4)  nodprobe -r cdc_acm
5)  reconenct the Nokia
6)  pon o2

and now it work again...  But sometimes, my Nokia (Symbian S60) crashs.

Normaly I can use "cdc_ether" plus "rndis_host" but any kernel modules I
have tried are crashing.  (Bugreport alredy to the Debian BTS)

Since the "cdc_ether" and the "rndis_host" is loaded automaticaly  if  I
connect my Nokia I had to remove the two modules plus usbnet physicaly.

Thanks, Greetings and nice Day/Evening
    Michelle Konzack
    Systemadministrator
    24V Electronic Engineer
    Tamay Dogan Network
    Debian GNU/Linux Consultant


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