Got "probe_modem(): Couldn't get caps" connecting via USB to Nokia E70, E51, N95

[Andreas Schildbach]

Binary package hint: network-manager

When I connected a Nokia E70 to a Dell X1 (Intrepid) via USB, I got the following syslog one time, and no "Auto GSM network connection" in the applet.

Sep 19 23:31:00 darkly kernel: [ 288.072128] usb 1-2: new full speed USB device using uhci_hcd and address 6
Sep 19 23:31:00 darkly kernel: [ 288.259169] usb 1-2: configuration #1 chosen from 1 choice
Sep 19 23:31:02 darkly kernel: [ 289.681571] cdc_acm 1-2:1.12: ttyACM0: USB ACM device
Sep 19 23:31:02 darkly kernel: [ 289.684415] usbcore: registered new interface driver cdc_acm
Sep 19 23:31:02 darkly kernel: [ 289.684757] cdc_acm: v0.26:USB Abstract Control Model driver for USB modems and ISDN adapters
Sep 19 23:31:02 darkly kernel: [ 289.872643] usbcore: registered new interface driver cdc_ether
Sep 19 23:31:02 darkly kernel: [ 289.886131] usb 1-2: bad CDC descriptors
Sep 19 23:31:02 darkly kernel: [ 289.887152] usbcore: registered new interface driver rndis_host
Sep 19 23:31:02 darkly kernel: [ 289.916536] usb 1-2: bad CDC descriptors
Sep 19 23:31:02 darkly kernel: [ 289.917737] usbcore: registered new interface driver rndis_wlan
Sep 19 23:31:03 darkly NetworkManager: <debug> [1221859863.034081] probe_modem(): Couldn't get caps

(full syslog appended to this bug)

Upon disconnecting and reconnecting, everything worked as normal.

[Chris Jones (cmsj)]

I see this when connecting an N95 in "PC Suite" mode. Disconnecting and reconnecting does not make it work though.

[Chris Jones (cmsj)]

It looks like the function which produces the caps getting error sends AT+GCAP. Using screen on /dev/ttyACM0 I see:

AT+GCAP
+GCAP: +CGSM,+DS,+W

OK

[Chris Jones (cmsj)]

After tracing the execution a little, it seems that the failure is happening quite early - in modem_probe_caps() the first exit point.

  err = write(fd, AT_CAPS_PROBE, sizeof(AT_CAPS_PROBE) - 1);

  if (err != sizeof(AT_CAPS_PROBE) - 1)
    return -1;

I will see if I can extract some more information with some debugging statements.

[Alexander Sack (asac)]

On Sun, Sep 28, 2008 at 12:46:16AM -0000, Chris Jones wrote:
> I see this when connecting an N95 in "PC Suite" mode. Disconnecting and
> reconnecting does not make it work though.

have you tried other modes? I think the PC Suite is just the wrong
mode (which is a bit confusing, yeah).

 - Alexander

[Chris Jones (cmsj)]

Hi

Alexander Sack wrote:
> have you tried other modes? I think the PC Suite is just the wrong
> mode (which is a bit confusing, yeah).

I have tried the Mass Storage mode, which didn't seem to present a
serial interface at all. I've not tried the media one (MTP/PTP), but I'm
not convinced those are correct either.
There is definitely a serial interface presented in PC Suite mode - I
was able to probe the caps of /dev/ttyACM0 by hand afterall. I've not
yet patched the function to say why it's failing though.

Cheers,
--
Chris Jones
  <email address hidden>
   www.canonical.com

[Andreas Schildbach (schildbach)]

On the E70, PC Suite mode is the only mode that works with NetworkManager.

[Alexander Sack (asac)]

On Sun, Sep 28, 2008 at 01:50:23AM -0000, Chris Jones wrote:
> After tracing the execution a little, it seems that the failure is
> happening quite early - in modem_probe_caps() the first exit point.
>
> err = write(fd, AT_CAPS_PROBE, sizeof(AT_CAPS_PROBE) - 1);
>
> if (err != sizeof(AT_CAPS_PROBE) - 1)
> return -1;
>
> I will see if I can extract some more information with some debugging
> statements.
>

you should build your NM with SERIAL_DEBUG 1 ... you can flip that
define in nm-device-serial.c iirc.

 - Alexander

[Bugsy (carlo-suomi24-deactivatedaccount)]

I have similar issues with Ubuntu 8.10 and Nokia E51. Nokia 3109 works fine thou.

[Thomas Hood (jdthood)]

Hi all. Is this fixed in Ubuntu 12.04?

[Launchpad Janitor (janitor)]

[Expired for network-manager (Ubuntu) because there has been no activity for 60 days.]