Before version 1.1.5 some devices popped up which want to be switched by
changing the device configuration. USB allows to provide multiple
internal "modes" that can be set with SELECT_CONFIGURATION.
In fact, that is how the whole mode switching SHOULD have been
implemented while following the specs.
Now, to handle multiple configurations, the current configuration (out of all
possible) has to be determined properly. Up to version 1.1.4 the class of
interfaces and other parameters were taken from the USB device structure by
looking into "dev->config[0]".
Strictly, this is only correct for devices with just a single possible
configuration. As soon as there are more than one configurations, the ACTIVE
configuration (which may have been set before) has to be determined. It could
be "dev->config[1]" or something else.
Therefore the GET_CONFIGURATION command is needed which must be
implemented by every USB device.
I have collected five modems from different "families"; none of them had any
problems with this request when testing on seven different distributions (and
kernels) so I did not expect this command to fail except in really hopeless
cases ...
What I would do in your case (and probably in the next release), is to simply
add a little quirk handling instead of just aborting:
[...]
if (ret < 0) {
fprintf(stderr, "Error getting the current configuration (error %d).
Falling back to configuration 1.\n", ret);
if (Configuration) {
fprintf(stderr, " No configuation setting possible for this device.\n",
ret);
Configuration = 0;
}
return 1;
}
[...]
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https://bugs.launchpad.net/bugs/769816
Title:
Switching of Samsung LTE modem does no longer work in Natty
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