On Thu, Sep 22, 2016 at 04:40:50PM +0200, Oliver Neukum wrote:
> 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.

On kernel-4.7.4 this gives this little output:

[  135.279989] sysrq: SysRq : Changing Loglevel
[  135.280489] sysrq: Loglevel set to 9
[  146.712004] usbcore: registered new interface driver cdc_acm
[  146.712537] cdc_acm: USB Abstract Control Model driver for USB modems and 
ISDN adapters
[  173.257346] usb 6-1: new full-speed USB device number 2 using uhci_hcd
[  173.450326] usb 6-1: New USB device found, idVendor=0572, idProduct=1340
[  173.450879] usb 6-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[  173.451374] usb 6-1: Product: USB Modem
[  173.451867] usb 6-1: Manufacturer: Conexant
[  173.452360] usb 6-1: SerialNumber: 12345678
[  173.455415] cdc_acm:acm_probe: cdc_acm 6-1:1.0: interfaces are valid
[  173.455995] cdc_acm 6-1:1.0: ttyACM0: USB ACM device
[  173.562316] cdc_acm:acm_ctrl_msg: cdc_acm 6-1:1.0: acm_ctrl_msg - rq 0x20, 
val 0x0, len 0x7, result 7


4.8-rc7 is compiling now..


Regards, Wim.

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