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. -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
