<html> <head> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body> Hi list, I'm using Ubuntu 18.04.3 lts on a Lenovo Thinkpad X1 carbon i7-6600 with modem LTE Sierra ID_MODEL=Sierra_Wireless_EM7455_Qualcomm_Snapdragon_X7_LTE-A. When the laptop is power up I can use the modem, but when the laptop went to sleep and after I resume it, the modem disappear. Now the laptop is resumed and the modem is not available to ModemManager 'cause this error: root@angelo-thinkpad-x1-carbon-4th:~# systemctl status ModemManager ● ModemManager.service - Modem Manager Loaded: loaded (/lib/systemd/system/ModemManager.service; enabled; vendor preset: enabled) Active: inactive (dead) since Sat 2019-12-07 16:52:35 CET; 30min ago Process: 13379 ExecStart=/usr/sbin/ModemManager --filter-policy=strict (code=exited, status=0/SUCCESS) Main PID: 13379 (code=exited, status=0/SUCCESS) dic 07 16:52:35 angelo-thinkpad-x1-carbon-4th systemd[1]: Starting Modem Manager... dic 07 16:52:35 angelo-thinkpad-x1-carbon-4th ModemManager[13379]: <info> ModemManager (version 1.10.0) starting in system bus... dic 07 16:52:35 angelo-thinkpad-x1-carbon-4th ModemManager[13379]: <warn> Could not acquire the 'org.freedesktop.ModemManager1' service name dic 07 16:52:35 angelo-thinkpad-x1-carbon-4th ModemManager[13379]: <info> ModemManager is shut down dic 07 16:52:35 angelo-thinkpad-x1-carbon-4th systemd[1]: Started Modem Manager. I looked at the archive, but I have found no one solution acceptable for me. Issuing lsusb I can found the modem: root@angelo-thinkpad-x1-carbon-4th:~# lsusb Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 005: ID 138a:0090 Validity Sensors, Inc. Bus 001 Device 004: ID 04f2:b5c1 Chicony Electronics Co., Ltd Bus 001 Device 003: ID 8087:0a2b Intel Corp. Bus 001 Device 017: ID 1199:9079 Sierra Wireless, Inc. Bus 001 Device 018: ID 1a86:7523 QinHeng Electronics HL-340 USB-Serial adapter Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub and the file in /etc/udev/rules.d root@angelo-thinkpad-x1-carbon-4th:~# more /etc/udev/rules.d/99-sierra.rules ACTION!="add|change", GOTO="mbim_to_qmi_rules_end" SUBSYSTEM!="usb|drivers", GOTO="mbim_to_qmi_rules_end" # load qmi_wwan module SUBSYSTEM=="usb", \ ATTR{idVendor}=="1199", ATTR{idProduct}=="9079", \ RUN+="/sbin/modprobe -b qmi_wwan" # force Dell WWAN 5809e to configuration #1 SUBSYSTEM=="usb", \ ATTR{idVendor}=="1199", ATTR{idProduct}=="9079", \ ATTR{bConfigurationValue}="1" # add the new id in the qmi_wwan driver SUBSYSTEM=="drivers", \ ENV{DEVPATH}=="/bus/usb/drivers/qmi_wwan", \ ATTR{new_id}="1199 9079" # load qcserial module SUBSYSTEM=="usb", \ ATTR{idVendor}=="1199", ATTR{idProduct}=="9079", \ RUN+="/sbin/modprobe -b qcserial" # add the new id in the qcserial driver SUBSYSTEM=="drivers", \ ENV{DEVPATH}=="/bus/usb-serial/drivers/qcserial", \ ATTR{new_id}="1199 9079" LABEL="mbim_to_qmi_rules_end" also root@angelo-thinkpad-x1-carbon-4th:~# udevadm info --attribute /sys/class/net/wwp0s20f0u2i12 Udevadm info starts with the device specified by the devpath and then walks up the chain of parent devices. It prints for every device found, all possible attributes in the udev rules key format. A rule to match, can be composed by the attributes of the device and the attributes from one single parent device. looking at device '/devices/pci0000:00/0000:00:14.0/usb1/1-2/1-2:1.12/net/wwp0s20f0u2i12': KERNEL=="wwp0s20f0u2i12" SUBSYSTEM=="net" DRIVER=="" ATTR{addr_assign_type}=="3" ATTR{addr_len}=="6" ATTR{address}=="e2:ab:3e:a9:14:02" ATTR{broadcast}=="ff:ff:ff:ff:ff:ff" ATTR{carrier_changes}=="0" ATTR{carrier_down_count}=="0" ATTR{carrier_up_count}=="0" ATTR{dev_id}=="0x0" ATTR{dev_port}=="0" ATTR{flags}=="0x1002" ATTR{gro_flush_timeout}=="0" ATTR{ifalias}=="" ATTR{ifindex}=="28" ATTR{iflink}=="28" ATTR{link_mode}=="0" ATTR{mtu}=="1500" ATTR{name_assign_type}=="4" ATTR{netdev_group}=="0" ATTR{operstate}=="down" ATTR{proto_down}=="0" ATTR{tx_queue_len}=="1000" ATTR{type}=="1" looking at parent device '/devices/pci0000:00/0000:00:14.0/usb1/1-2/1-2:1.12': KERNELS=="1-2:1.12" SUBSYSTEMS=="usb" DRIVERS=="qmi_wwan" ATTRS{authorized}=="1" ATTRS{bAlternateSetting}==" 0" ATTRS{bInterfaceClass}=="02" ATTRS{bInterfaceNumber}=="0c" ATTRS{bInterfaceProtocol}=="00" ATTRS{bInterfaceSubClass}=="0e" ATTRS{bNumEndpoints}=="01" ATTRS{iad_bFirstInterface}=="0c" ATTRS{iad_bFunctionClass}=="02" ATTRS{iad_bFunctionProtocol}=="00" ATTRS{iad_bFunctionSubClass}=="0e" ATTRS{iad_bInterfaceCount}=="02" ATTRS{supports_autosuspend}=="1" looking at parent device '/devices/pci0000:00/0000:00:14.0/usb1/1-2': KERNELS=="1-2" SUBSYSTEMS=="usb" DRIVERS=="usb" ATTRS{authorized}=="1" ATTRS{avoid_reset_quirk}=="0" ATTRS{bConfigurationValue}=="1" ATTRS{bDeviceClass}=="00" ATTRS{bDeviceProtocol}=="00" ATTRS{bDeviceSubClass}=="00" ATTRS{bMaxPacketSize0}=="64" ATTRS{bMaxPower}=="500mA" ATTRS{bNumConfigurations}=="1" ATTRS{bNumInterfaces}==" 2" ATTRS{bcdDevice}=="0006" ATTRS{bmAttributes}=="a0" ATTRS{busnum}=="1" ATTRS{configuration}=="" ATTRS{devnum}=="17" ATTRS{devpath}=="2" ATTRS{idProduct}=="9079" ATTRS{idVendor}=="1199" ATTRS{ltm_capable}=="no" ATTRS{manufacturer}=="Sierra Wireless, Incorporated" ATTRS{maxchild}=="0" ATTRS{product}=="Sierra Wireless EM7455 Qualcomm Snapdragon X7 LTE-A" ATTRS{quirks}=="0x0" ATTRS{removable}=="fixed" ATTRS{rx_lanes}=="1" ATTRS{serial}=="LF71223242011020" ATTRS{speed}=="480" ATTRS{tx_lanes}=="1" ATTRS{urbnum}=="82" ATTRS{version}==" 2.10" looking at parent device '/devices/pci0000:00/0000:00:14.0/usb1': KERNELS=="usb1" SUBSYSTEMS=="usb" DRIVERS=="usb" ATTRS{authorized}=="1" ATTRS{authorized_default}=="1" ATTRS{avoid_reset_quirk}=="0" ATTRS{bConfigurationValue}=="1" ATTRS{bDeviceClass}=="09" ATTRS{bDeviceProtocol}=="01" ATTRS{bDeviceSubClass}=="00" ATTRS{bMaxPacketSize0}=="64" ATTRS{bMaxPower}=="0mA" ATTRS{bNumConfigurations}=="1" ATTRS{bNumInterfaces}==" 1" ATTRS{bcdDevice}=="0500" ATTRS{bmAttributes}=="e0" ATTRS{busnum}=="1" ATTRS{configuration}=="" ATTRS{devnum}=="1" ATTRS{devpath}=="0" ATTRS{idProduct}=="0002" ATTRS{idVendor}=="1d6b" ATTRS{interface_authorized_default}=="1" ATTRS{ltm_capable}=="no" ATTRS{manufacturer}=="Linux 5.0.0-37-generic xhci-hcd" ATTRS{maxchild}=="12" ATTRS{product}=="xHCI Host Controller" ATTRS{quirks}=="0x0" ATTRS{removable}=="unknown" ATTRS{rx_lanes}=="1" ATTRS{serial}=="0000:00:14.0" ATTRS{speed}=="480" ATTRS{tx_lanes}=="1" ATTRS{urbnum}=="6043" ATTRS{version}==" 2.00" looking at parent device '/devices/pci0000:00/0000:00:14.0': KERNELS=="0000:00:14.0" SUBSYSTEMS=="pci" DRIVERS=="xhci_hcd" ATTRS{ari_enabled}=="0" ATTRS{broken_parity_status}=="0" ATTRS{class}=="0x0c0330" ATTRS{consistent_dma_mask_bits}=="64" ATTRS{d3cold_allowed}=="1" ATTRS{dbc}=="disabled" ATTRS{device}=="0x9d2f" ATTRS{dma_mask_bits}=="64" ATTRS{driver_override}=="(null)" ATTRS{enable}=="1" ATTRS{irq}=="122" ATTRS{local_cpulist}=="0-3" ATTRS{local_cpus}=="f" ATTRS{msi_bus}=="1" ATTRS{numa_node}=="-1" ATTRS{revision}=="0x21" ATTRS{subsystem_device}=="0x2238" ATTRS{subsystem_vendor}=="0x17aa" ATTRS{vendor}=="0x8086" looking at parent device '/devices/pci0000:00': KERNELS=="pci0000:00" SUBSYSTEMS=="" DRIVERS=="" thanks, Angelo </body> </html>