On Wed, 2016-09-21 at 18:41 +0200, Wim Osterholt wrote:
> On Wed, Sep 21, 2016 at 02:21:17PM +0200, Oliver Neukum wrote:
> > in sysfs.
> 
> Google pointed me to /sys/bus/usb/drivers/usb/*
> where I find all kinds of 'bConfigurationValue'.
> Now is the problem to find which one you could mean.
> 
> Under /sys/bus/usb/drivers/usb/7-1  I find
> manufacturer  which reads 'Conexant'  and
> bConfigurationValue  which reads '1'

OK. Strange. Please do

dmesg -c
echo 9 > /proc/sysrq-trigger
modprobe cdc_acm
echo "module cdc_acm +mpf" > /sys/kernel/debug/dynamic_debug/control

[plug your device in]

and provide the full output of dmesg after that.

        Regards
                Oliver


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