Same issue with a Motorola A910 phone. Here is syslog with debug priority: Jun 15 15:37:55 chimera kernel: [118371.440119] usb 3-1: new full speed USB device using uhci_hcd and address 3 Jun 15 15:37:55 chimera udevd[7639]: seq 1923 queued, 'add' 'usb' Jun 15 15:37:55 chimera udevd-event[21354]: device 0x7fc3532683e0 has devpath '/devices/pci0000:00/0000:00:1a.0/usb3/3-1' Jun 15 15:37:55 chimera udevd-event[21354]: device 0x7fc353267ce0 has devpath '/devices/pci0000:00/0000:00:1a.0/usb3' Jun 15 15:37:55 chimera udevd-event[21354]: device 0x7fc353268590 has devpath '/devices/pci0000:00/0000:00:1a.0' Jun 15 15:37:55 chimera udevd-event[21354]: device 0x7fc353268990 has devpath '/devices/pci0000:00' Jun 15 15:37:55 chimera udevd-event[21354]: LINK 'char/189:258' /lib/udev/rules.d/50-udev-default.rules:5 Jun 15 15:37:55 chimera udevd-event[21354]: MODE 0664 /lib/udev/rules.d/50-udev-default.rules:53 Jun 15 15:37:55 chimera udevd-event[21354]: NAME 'bus/usb/003/003' /lib/udev/rules.d/50-udev-default.rules:53 Jun 15 15:37:55 chimera udevd-event[21354]: RUN 'socket:@/org/freedesktop/hal/udev_event' /lib/udev/rules.d/90-hal.rules:2 Jun 15 15:37:55 chimera udevd-event[21354]: create db link (bus/usb/003/003 char/189:258) Jun 15 15:37:55 chimera udevd-event[21354]: creating device node '/dev/bus/usb/003/003', devnum=189:258, mode=0664, uid=0, gid=0 Jun 15 15:37:55 chimera udevd-event[21354]: mknod(/dev/bus/usb/003/003, 020664, (189,258)) Jun 15 15:37:55 chimera udevd-event[21354]: chmod(/dev/bus/usb/003/003, 020664) Jun 15 15:37:55 chimera udevd-event[21354]: chown(/dev/bus/usb/003/003, 0, 0) Jun 15 15:37:55 chimera udevd-event[21354]: '/dev/char/189:258' with target '/dev/bus/usb/003/003' has the highest priority 0, create it Jun 15 15:37:55 chimera udevd-event[21354]: creating symlink '/dev/char/189:258' to '../bus/usb/003/003' Jun 15 15:37:55 chimera udevd-event[21354]: passed 321 bytes to monitor 0x7fc3532683e0 Jun 15 15:37:55 chimera udevd-event[21354]: passed -1 bytes to monitor 0x7fc353257670 Jun 15 15:37:55 chimera udevd-event[21354]: seq 1923 exit with 0 Jun 15 15:37:55 chimera udevd[7639]: seq 1923 forked, pid [21354], 'add' 'usb', 0 seconds old Jun 15 15:37:55 chimera udevd[7639]: seq 1923 cleanup, pid [21354], status 0, 0 seconds old Jun 15 15:37:55 chimera kernel: [118371.624561] usb 3-1: configuration #1 chosen from 1 choice Jun 15 15:37:55 chimera kernel: [118371.630972] cdc_acm 3-1:1.0: ttyACM0: USB ACM device Jun 15 15:37:55 chimera udevd[7639]: seq 1924 queued, 'add' 'usb' Jun 15 15:37:55 chimera udevd-event[21355]: RUN 'socket:@/org/freedesktop/hal/udev_event' /lib/udev/rules.d/90-hal.rules:2 Jun 15 15:37:55 chimera udevd-event[21355]: passed 313 bytes to monitor 0x7fc353268f40 Jun 15 15:37:55 chimera udevd-event[21355]: passed -1 bytes to monitor 0x7fc353257670 Jun 15 15:37:55 chimera udevd-event[21355]: seq 1924 exit with 0 Jun 15 15:37:55 chimera udevd[7639]: seq 1924 forked, pid [21355], 'add' 'usb', 0 seconds old Jun 15 15:37:55 chimera udevd[7639]: seq 1924 cleanup, pid [21355], status 0, 0 seconds old Jun 15 15:37:55 chimera udevd[7639]: seq 1925 queued, 'add' 'tty' Jun 15 15:37:55 chimera udevd-event[21356]: device 0x7fc353268f20 has devpath '/devices/pci0000:00/0000:00:1a.0/usb3/3-1/3-1:1.0/tty/ttyACM0' Jun 15 15:37:55 chimera udevd-event[21356]: device 0x7fc353267ce0 has devpath '/devices/pci0000:00/0000:00:1a.0/usb3/3-1/3-1:1.0' Jun 15 15:37:55 chimera udevd-event[21356]: device 0x7fc353268990 has devpath '/devices/pci0000:00/0000:00:1a.0/usb3/3-1' Jun 15 15:37:55 chimera udevd-event[21356]: device 0x7fc353268310 has devpath '/devices/pci0000:00/0000:00:1a.0/usb3' Jun 15 15:37:55 chimera udevd-event[21356]: device 0x7fc353268570 has devpath '/devices/pci0000:00/0000:00:1a.0' Jun 15 15:37:55 chimera udevd-event[21356]: device 0x7fc35325b050 has devpath '/devices/pci0000:00' Jun 15 15:37:55 chimera udevd-event[21356]: LINK 'char/166:0' /lib/udev/rules.d/50-udev-default.rules:5 Jun 15 15:37:55 chimera udevd-event[21356]: GROUP 20 /lib/udev/rules.d/50-udev-default.rules:16 Jun 15 15:37:55 chimera udevd-event[21356]: IMPORT 'path_id' /lib/udev/rules.d/60-persistent-serial.rules:9 Jun 15 15:37:55 chimera udevd-event[21356]: 'path_id' Jun 15 15:37:55 chimera udevd[7639]: seq 1925 forked, pid [21356], 'add' 'tty', 0 seconds old Jun 15 15:37:55 chimera udevd[7639]: seq 1926 queued, 'add' 'usb_endpoint' Jun 15 15:37:55 chimera udevd-event[21359]: device 0x7fc353267db0 has devpath '/devices/pci0000:00/0000:00:1a.0/usb3/3-1/3-1:1.0/usb_endpoint/usbdev3.3_ep83' Jun 15 15:37:55 chimera udevd-event[21359]: device 0x7fc353268b30 has devpath '/devices/pci0000:00/0000:00:1a.0/usb3/3-1/3-1:1.0' Jun 15 15:37:55 chimera udevd-event[21359]: device 0x7fc353268470 has devpath '/devices/pci0000:00/0000:00:1a.0/usb3/3-1' Jun 15 15:37:55 chimera udevd-event[21359]: device 0x7fc35325b000 has devpath '/devices/pci0000:00/0000:00:1a.0/usb3' Jun 15 15:37:55 chimera udevd-event[21359]: device 0x7fc35325b2e0 has devpath '/devices/pci0000:00/0000:00:1a.0' Jun 15 15:37:55 chimera udevd-event[21359]: device 0x7fc35325b590 has devpath '/devices/pci0000:00' Jun 15 15:37:55 chimera udevd-event[21359]: LINK 'char/252:26' /lib/udev/rules.d/50-udev-default.rules:5 Jun 15 15:37:55 chimera udevd-event[21359]: RUN 'socket:@/org/freedesktop/hal/udev_event' /lib/udev/rules.d/90-hal.rules:2 Jun 15 15:37:55 chimera udevd-event[21359]: no node name set, will use kernel name 'usbdev3.3_ep83' Jun 15 15:37:55 chimera udevd-event[21359]: create db link (usbdev3.3_ep83 char/252:26) Jun 15 15:37:55 chimera udevd-event[21359]: creating device node '/dev/usbdev3.3_ep83', devnum=252:26, mode=0660, uid=0, gid=0 Jun 15 15:37:55 chimera udevd-event[21359]: mknod(/dev/usbdev3.3_ep83, 020660, (252,26)) Jun 15 15:37:55 chimera udevd-event[21359]: chmod(/dev/usbdev3.3_ep83, 020660) Jun 15 15:37:55 chimera udevd-event[21359]: chown(/dev/usbdev3.3_ep83, 0, 0) Jun 15 15:37:55 chimera udevd-event[21359]: '/dev/char/252:26' with target '/dev/usbdev3.3_ep83' has the highest priority 0, create it Jun 15 15:37:55 chimera udevd-event[21359]: creating symlink '/dev/char/252:26' to '../usbdev3.3_ep83' Jun 15 15:37:55 chimera udevd-event[21359]: passed 298 bytes to monitor 0x7fc353267db0 Jun 15 15:37:55 chimera udevd-event[21359]: passed -1 bytes to monitor 0x7fc353257670 Jun 15 15:37:55 chimera udevd-event[21359]: seq 1926 exit with 0 Jun 15 15:37:55 chimera udevd[7639]: seq 1926 forked, pid [21359], 'add' 'usb_endpoint', 0 seconds old Jun 15 15:37:55 chimera udevd[7639]: seq 1926 cleanup, pid [21359], status 0, 0 seconds old Jun 15 15:37:55 chimera udevd[7639]: seq 1927 queued, 'add' 'usb' Jun 15 15:37:55 chimera udevd-event[21361]: RUN 'socket:@/org/freedesktop/hal/udev_event' /lib/udev/rules.d/90-hal.rules:2 Jun 15 15:37:55 chimera udevd-event[21361]: passed 329 bytes to monitor 0x7fc353268bc0 Jun 15 15:37:55 chimera udevd-event[21361]: passed -1 bytes to monitor 0x7fc353257670 Jun 15 15:37:55 chimera udevd-event[21361]: seq 1927 exit with 0 Jun 15 15:37:55 chimera udevd[7639]: seq 1927 forked, pid [21361], 'add' 'usb', 0 seconds old Jun 15 15:37:55 chimera udevd[7639]: seq 1927 cleanup, pid [21361], status 0, 0 seconds old Jun 15 15:37:55 chimera udevd-event[21356]: '/lib/udev/path_id' (stdout) 'ID_PATH=pci-0000:00:1a.0-usb-0:1:1.0' Jun 15 15:37:55 chimera udevd-event[21356]: '/lib/udev/path_id' returned with status 0 Jun 15 15:37:55 chimera udevd-event[21356]: LINK 'serial/by-path/pci-0000:00:1a.0-usb-0:1:1.0' /lib/udev/rules.d/60-persistent-serial.rules:10 Jun 15 15:37:55 chimera udevd-event[21356]: IMPORT 'usb_id --export /devices/pci0000:00/0000:00:1a.0/usb3/3-1/3-1:1.0/tty/ttyACM0' /lib/udev/rules.d/60-persistent-serial.rules:13 Jun 15 15:37:55 chimera udevd-event[21356]: 'usb_id --export /devices/pci0000:00/0000:00:1a.0/usb3/3-1/3-1:1.0/tty/ttyACM0' Jun 15 15:37:55 chimera usb_id[21364]: custom logging function 0x7f817f48c010 registered Jun 15 15:37:55 chimera usb_id[21364]: device 0x7f817f48c160 has devpath '/devices/pci0000:00/0000:00:1a.0/usb3/3-1/3-1:1.0/tty/ttyACM0' Jun 15 15:37:55 chimera usb_id[21364]: device 0x7f817f48c4a0 has devpath '/devices/pci0000:00/0000:00:1a.0/usb3/3-1/3-1:1.0' Jun 15 15:37:55 chimera usb_id[21364]: /sys/devices/pci0000:00/0000:00:1a.0/usb3/3-1/3-1:1.0: if_class 2 protocol 0 Jun 15 15:37:55 chimera usb_id[21364]: device 0x7f817f48cec0 has devpath '/devices/pci0000:00/0000:00:1a.0/usb3/3-1' Jun 15 15:37:55 chimera udevd-event[21356]: '/lib/udev/usb_id' (stdout) 'ID_VENDOR=Motorola' Jun 15 15:37:55 chimera udevd-event[21356]: '/lib/udev/usb_id' (stdout) 'ID_VENDOR_ENC=Motorola' Jun 15 15:37:55 chimera udevd-event[21356]: '/lib/udev/usb_id' (stdout) 'ID_VENDOR_ID=22b8' Jun 15 15:37:55 chimera udevd-event[21356]: '/lib/udev/usb_id' (stdout) 'ID_MODEL=Motorola_USB_Modem' Jun 15 15:37:55 chimera udevd-event[21356]: '/lib/udev/usb_id' (stdout) 'ID_MODEL_ENC=Motorola\x20USB\x20Modem' Jun 15 15:37:55 chimera udevd-event[21356]: '/lib/udev/usb_id' (stdout) 'ID_MODEL_ID=3802' Jun 15 15:37:55 chimera udevd-event[21356]: '/lib/udev/usb_id' (stdout) 'ID_REVISION=0000' Jun 15 15:37:55 chimera udevd-event[21356]: '/lib/udev/usb_id' (stdout) 'ID_SERIAL=Motorola_Motorola_USB_Modem' Jun 15 15:37:55 chimera udevd-event[21356]: '/lib/udev/usb_id' (stdout) 'ID_TYPE=generic' Jun 15 15:37:55 chimera udevd-event[21356]: '/lib/udev/usb_id' (stdout) 'ID_BUS=usb' Jun 15 15:37:55 chimera udevd-event[21356]: '/lib/udev/usb_id' (stdout) 'ID_USB_INTERFACE_NUM=00' Jun 15 15:37:55 chimera udevd-event[21356]: '/lib/udev/usb_id' (stdout) 'ID_USB_DRIVER=cdc_acm' Jun 15 15:37:55 chimera udevd-event[21356]: '/lib/udev/usb_id' (stderr) 'error opening USB device 'descriptors' file' Jun 15 15:37:55 chimera udevd-event[21356]: '/lib/udev/usb_id' returned with status 0 Jun 15 15:37:55 chimera udevd-event[21356]: LINK 'serial/by-id/usb-Motorola_Motorola_USB_Modem-if00' /lib/udev/rules.d/60-persistent-serial.rules:17 Jun 15 15:37:55 chimera udevd-event[21356]: mknod(/dev/.tmp-char-166:0, 020600, (166,0)) Jun 15 15:37:55 chimera udevd-event[21356]: chmod(/dev/.tmp-char-166:0, 020600) Jun 15 15:37:55 chimera udevd-event[21356]: chown(/dev/.tmp-char-166:0, 0, 0) Jun 15 15:37:55 chimera udevd-event[21356]: IMPORT 'nm-modem-probe --vid 0x22b8 --pid 0x3802 --usb-interface 00 --driver cdc_acm --delay 3000 --export /dev/.tmp-char-166:0' /lib/udev/rules.d/77-nm-probe-modem-capabilities.rules:20 Jun 15 15:37:55 chimera udevd-event[21356]: 'nm-modem-probe --vid 0x22b8 --pid 0x3802 --usb-interface 00 --driver cdc_acm --delay 3000 --export /dev/.tmp-char-166:0' Jun 15 15:37:55 chimera udevd[7639]: seq 1928 queued, 'add' 'usb_endpoint' Jun 15 15:37:55 chimera udevd-event[21366]: device 0x7fc353268310 has devpath '/devices/pci0000:00/0000:00:1a.0/usb3/3-1/3-1:1.1/usb_endpoint/usbdev3.3_ep01' Jun 15 15:37:55 chimera udevd-event[21366]: device 0x7fc3532684c0 has devpath '/devices/pci0000:00/0000:00:1a.0/usb3/3-1/3-1:1.1' Jun 15 15:37:55 chimera udevd-event[21366]: device 0x7fc35325b000 has devpath '/devices/pci0000:00/0000:00:1a.0/usb3/3-1' Jun 15 15:37:55 chimera udevd-event[21366]: device 0x7fc35325b270 has devpath '/devices/pci0000:00/0000:00:1a.0/usb3' Jun 15 15:37:55 chimera udevd-event[21366]: device 0x7fc35325b4d0 has devpath '/devices/pci0000:00/0000:00:1a.0' Jun 15 15:37:55 chimera udevd-event[21366]: device 0x7fc35325b720 has devpath '/devices/pci0000:00' Jun 15 15:37:55 chimera udevd-event[21366]: LINK 'char/252:27' /lib/udev/rules.d/50-udev-default.rules:5 Jun 15 15:37:55 chimera udevd-event[21366]: RUN 'socket:@/org/freedesktop/hal/udev_event' /lib/udev/rules.d/90-hal.rules:2 Jun 15 15:37:55 chimera udevd-event[21366]: no node name set, will use kernel name 'usbdev3.3_ep01' Jun 15 15:37:55 chimera udevd-event[21366]: create db link (usbdev3.3_ep01 char/252:27) Jun 15 15:37:55 chimera udevd-event[21366]: creating device node '/dev/usbdev3.3_ep01', devnum=252:27, mode=0660, uid=0, gid=0 Jun 15 15:37:55 chimera udevd-event[21366]: mknod(/dev/usbdev3.3_ep01, 020660, (252,27)) Jun 15 15:37:55 chimera udevd-event[21366]: chmod(/dev/usbdev3.3_ep01, 020660) Jun 15 15:37:55 chimera udevd-event[21366]: chown(/dev/usbdev3.3_ep01, 0, 0) Jun 15 15:37:55 chimera udevd-event[21366]: '/dev/char/252:27' with target '/dev/usbdev3.3_ep01' has the highest priority 0, create it Jun 15 15:37:55 chimera udevd-event[21366]: creating symlink '/dev/char/252:27' to '../usbdev3.3_ep01' Jun 15 15:37:55 chimera udevd-event[21366]: passed 298 bytes to monitor 0x7fc353268310 Jun 15 15:37:55 chimera udevd-event[21366]: passed -1 bytes to monitor 0x7fc353257670 Jun 15 15:37:55 chimera udevd-event[21366]: seq 1928 exit with 0 Jun 15 15:37:55 chimera udevd[7639]: seq 1928 forked, pid [21366], 'add' 'usb_endpoint', 0 seconds old Jun 15 15:37:55 chimera udevd[7639]: seq 1928 cleanup, pid [21366], status 0, 0 seconds old Jun 15 15:37:55 chimera udevd[7639]: seq 1929 queued, 'add' 'usb_endpoint' Jun 15 15:37:55 chimera udevd-event[21367]: device 0x7fc353268af0 has devpath '/devices/pci0000:00/0000:00:1a.0/usb3/3-1/3-1:1.1/usb_endpoint/usbdev3.3_ep82' Jun 15 15:37:55 chimera udevd-event[21367]: device 0x7fc353268310 has devpath '/devices/pci0000:00/0000:00:1a.0/usb3/3-1/3-1:1.1' Jun 15 15:37:55 chimera udevd-event[21367]: device 0x7fc353268540 has devpath '/devices/pci0000:00/0000:00:1a.0/usb3/3-1' Jun 15 15:37:55 chimera udevd-event[21367]: device 0x7fc35325b000 has devpath '/devices/pci0000:00/0000:00:1a.0/usb3' Jun 15 15:37:55 chimera udevd-event[21367]: device 0x7fc35325b2e0 has devpath '/devices/pci0000:00/0000:00:1a.0' Jun 15 15:37:55 chimera udevd-event[21367]: device 0x7fc35325b590 has devpath '/devices/pci0000:00' Jun 15 15:37:55 chimera udevd-event[21367]: LINK 'char/252:28' /lib/udev/rules.d/50-udev-default.rules:5 Jun 15 15:37:55 chimera udevd-event[21367]: RUN 'socket:@/org/freedesktop/hal/udev_event' /lib/udev/rules.d/90-hal.rules:2 Jun 15 15:37:55 chimera udevd-event[21367]: no node name set, will use kernel name 'usbdev3.3_ep82' Jun 15 15:37:55 chimera udevd-event[21367]: create db link (usbdev3.3_ep82 char/252:28) Jun 15 15:37:55 chimera udevd-event[21367]: creating device node '/dev/usbdev3.3_ep82', devnum=252:28, mode=0660, uid=0, gid=0 Jun 15 15:37:55 chimera udevd-event[21367]: mknod(/dev/usbdev3.3_ep82, 020660, (252,28)) Jun 15 15:37:55 chimera udevd-event[21367]: chmod(/dev/usbdev3.3_ep82, 020660) Jun 15 15:37:55 chimera udevd-event[21367]: chown(/dev/usbdev3.3_ep82, 0, 0) Jun 15 15:37:55 chimera udevd-event[21367]: '/dev/char/252:28' with target '/dev/usbdev3.3_ep82' has the highest priority 0, create it Jun 15 15:37:55 chimera udevd-event[21367]: creating symlink '/dev/char/252:28' to '../usbdev3.3_ep82' Jun 15 15:37:55 chimera udevd-event[21367]: passed 298 bytes to monitor 0x7fc353268af0 Jun 15 15:37:55 chimera udevd-event[21367]: passed -1 bytes to monitor 0x7fc353257670 Jun 15 15:37:55 chimera udevd-event[21367]: seq 1929 exit with 0 Jun 15 15:37:55 chimera udevd[7639]: seq 1929 forked, pid [21367], 'add' 'usb_endpoint', 0 seconds old Jun 15 15:37:55 chimera udevd[7639]: seq 1929 cleanup, pid [21367], status 0, 0 seconds old Jun 15 15:37:55 chimera udevd[7639]: seq 1930 queued, 'add' 'usb_endpoint' Jun 15 15:37:55 chimera udevd-event[21368]: device 0x7fc353268af0 has devpath '/devices/pci0000:00/0000:00:1a.0/usb3/3-1/usb_endpoint/usbdev3.3_ep00' Jun 15 15:37:55 chimera udevd-event[21368]: device 0x7fc353268310 has devpath '/devices/pci0000:00/0000:00:1a.0/usb3/3-1' Jun 15 15:37:55 chimera udevd-event[21368]: device 0x7fc353268560 has devpath '/devices/pci0000:00/0000:00:1a.0/usb3' Jun 15 15:37:55 chimera udevd-event[21368]: device 0x7fc35325b050 has devpath '/devices/pci0000:00/0000:00:1a.0' Jun 15 15:37:55 chimera udevd-event[21368]: device 0x7fc35325b2a0 has devpath '/devices/pci0000:00' Jun 15 15:37:55 chimera udevd-event[21368]: LINK 'char/252:29' /lib/udev/rules.d/50-udev-default.rules:5 Jun 15 15:37:55 chimera udevd-event[21368]: RUN 'socket:@/org/freedesktop/hal/udev_event' /lib/udev/rules.d/90-hal.rules:2 Jun 15 15:37:55 chimera udevd-event[21368]: no node name set, will use kernel name 'usbdev3.3_ep00' Jun 15 15:37:55 chimera udevd-event[21368]: create db link (usbdev3.3_ep00 char/252:29) Jun 15 15:37:55 chimera udevd-event[21368]: creating device node '/dev/usbdev3.3_ep00', devnum=252:29, mode=0660, uid=0, gid=0 Jun 15 15:37:55 chimera udevd-event[21368]: mknod(/dev/usbdev3.3_ep00, 020660, (252,29)) Jun 15 15:37:55 chimera udevd-event[21368]: chmod(/dev/usbdev3.3_ep00, 020660) Jun 15 15:37:55 chimera udevd-event[21368]: chown(/dev/usbdev3.3_ep00, 0, 0) Jun 15 15:37:55 chimera udevd-event[21368]: '/dev/char/252:29' with target '/dev/usbdev3.3_ep00' has the highest priority 0, create it Jun 15 15:37:55 chimera udevd-event[21368]: creating symlink '/dev/char/252:29' to '../usbdev3.3_ep00' Jun 15 15:37:55 chimera udevd-event[21368]: passed 282 bytes to monitor 0x7fc353268af0 Jun 15 15:37:55 chimera udevd-event[21368]: passed -1 bytes to monitor 0x7fc353257670 Jun 15 15:37:55 chimera udevd-event[21368]: seq 1930 exit with 0 Jun 15 15:37:55 chimera udevd[7639]: seq 1930 forked, pid [21368], 'add' 'usb_endpoint', 0 seconds old Jun 15 15:37:55 chimera udevd[7639]: seq 1930 cleanup, pid [21368], status 0, 0 seconds old Jun 15 15:37:56 chimera udevd-event[21356]: '/lib/udev/nm-modem-probe' (stderr) 'error writing command: 5' Jun 15 15:38:02 chimera last message repeated 19 times Jun 15 15:38:02 chimera udevd-event[21356]: '/lib/udev/nm-modem-probe' (stdout) 'ID_NM_MODEM_PROBED=1' Jun 15 15:38:02 chimera udevd-event[21356]: '/lib/udev/nm-modem-probe' returned with status 0 Jun 15 15:38:02 chimera udevd-event[21356]: RUN 'socket:@/org/freedesktop/hal/udev_event' /lib/udev/rules.d/90-hal.rules:2 Jun 15 15:38:02 chimera udevd-event[21356]: no node name set, will use kernel name 'ttyACM0' Jun 15 15:38:02 chimera udevd-event[21356]: created db file for '/devices/pci0000:00/0000:00:1a.0/usb3/3-1/3-1:1.0/tty/ttyACM0' in '/dev/.udev/db/\x2fdevices\x2fpci0000:00\x2f0000:00:1a.0\x2fusb3\x2f3-1\x2f3-1:1.0\x2ftty\x2fttyACM0' Jun 15 15:38:02 chimera udevd-event[21356]: creating device node '/dev/ttyACM0', devnum=166:0, mode=0660, uid=0, gid=20 Jun 15 15:38:02 chimera udevd-event[21356]: mknod(/dev/ttyACM0, 020660, (166,0)) Jun 15 15:38:02 chimera udevd-event[21356]: chmod(/dev/ttyACM0, 020660) Jun 15 15:38:02 chimera udevd-event[21356]: chown(/dev/ttyACM0, 0, 20) Jun 15 15:38:02 chimera udevd-event[21356]: '/dev/char/166:0' with target '/dev/ttyACM0' has the highest priority 0, create it Jun 15 15:38:02 chimera udevd-event[21356]: creating symlink '/dev/char/166:0' to '../ttyACM0' Jun 15 15:38:02 chimera udevd-event[21356]: '/dev/serial/by-path/pci-0000:00:1a.0-usb-0:1:1.0' with target '/dev/ttyACM0' has the highest priority 0, create it Jun 15 15:38:02 chimera udevd-event[21356]: creating symlink '/dev/serial/by-path/pci-0000:00:1a.0-usb-0:1:1.0' to '../../ttyACM0' Jun 15 15:38:02 chimera udevd-event[21356]: '/dev/serial/by-id/usb-Motorola_Motorola_USB_Modem-if00' with target '/dev/ttyACM0' has the highest priority 0, create it Jun 15 15:38:02 chimera udevd-event[21356]: creating symlink '/dev/serial/by-id/usb-Motorola_Motorola_USB_Modem-if00' to '../../ttyACM0' Jun 15 15:38:02 chimera udevd-event[21356]: passed 750 bytes to monitor 0x7fc353268f20 Jun 15 15:38:02 chimera udevd-event[21356]: passed -1 bytes to monitor 0x7fc353257670 Jun 15 15:38:02 chimera udevd-event[21356]: seq 1925 exit with 0 Jun 15 15:38:02 chimera udevd[7639]: seq 1925 cleanup, pid [21356], status 0, 7 seconds old Jun 15 15:38:02 chimera nm-system-settings: SCPlugin-Ifupdown: device added (udi: /org/freedesktop/Hal/devices/usb_device_22b8_3802_noserial_if0_serial_unknown_0, iface: (null)): iface not found Jun 15 15:38:02 chimera NetworkManager: (ttyACM0): found serial port (udev: hal:GSM) Jun 15 15:38:02 chimera NetworkManager: (ttyACM0): ignoring due to lack of probed mobile broadband capabilties Here is the probe: L: main(): (/dev/ttyACM0): usb-vid 0x0000 usb-pid 0x0000 usb-intf 0 driver '(null)' L: main(): probing /dev/ttyACM0 L: modem_send_command(): Sending: 'AT+GCAP ' L: modem_wait_reply(): Got: 'A' L: modem_wait_reply(): Got: 'AT+' L: modem_wait_reply(): Got: 'AT+G' L: modem_wait_reply(): Got: 'AT+GCAP' L: modem_wait_reply(): Got: 'AT+GCAP +GCAP: +FCLASS OK ' L: modem_probe_caps(): GCAP response: +GCAP: +FCLASS L: modem_send_command(): Sending: 'AT+GMM ' L: modem_wait_reply(): Got: 'A' L: modem_wait_reply(): Got: 'AT' L: modem_wait_reply(): Got: 'AT+G' L: modem_wait_reply(): Got: 'AT+GMM A910 OK ' ID_NM_MODEM_PROBED=1 L: main(): /dev/ttyACM0: caps (0x20)