Hi, this is your Linux kernel regression tracker. I noticed a regression report in bugzilla.kernel.org that afaics nobody acted upon since it was reported. That's why I decided to forward it by mail to those that afaics should handle this. To quote from https://bugzilla.kernel.org/show_bug.cgi?id=216336 : > S.Bonomar 2022-08-08 05:28:54 UTC > > i am new on kernel development, > i can successfully use my Huawei vodafone k4203 usb modem with kernel version 4.15(I test it on ubuntu-18.04.1 LTS with kernel 4.15 (i donwlaod this iso on 2018)) but when i try to use it with the newer 5.x.x kernel i get the error "kernel: cdc_mbim 2-1.5:2.0: SET_NTB_FORMAT failed > kernel: cdc_mbim 2-1.5:2.0: bind() failure" > > when I want to use I enter on ubuntu-18.04.1LTS, insert the device and reboot and enter on fedora-36 > but when I enter the fedora-36 and insert the device, reboot and enter the ubuntu-18.04.1 LTS, the device fails on ubuntu-18.04.1 LTS, just remove and insert again and it works > > Now i'm use (Fedora_36 kernel 5.18.13-200.x86_64) > I compiled the kernel-{5.4,4.19} longterm and the problem persist > But when I access the 4.x.x kernel then reboot the PC and access the 5.x.x kernel it works, do you have any idea how I can solve this problem ? :) > > Note: the modem has a dhcp server and web server. > > My log on fedora-36: > [ 115.571291] usb 2-1.4: new high-speed USB device number 7 using ehci-pci > [ 115.652037] usb 2-1.4: New USB device found, idVendor=12d1, idProduct=1f1c, bcdDevice= 1.02 > [ 115.652045] usb 2-1.4: New USB device strings: Mfr=1, Product=2, SerialNumber=3 > [ 115.652049] usb 2-1.4: Product: HUAWEI Mobile > [ 115.652052] usb 2-1.4: Manufacturer: Vodafone(Huawei) > [ 115.652054] usb 2-1.4: SerialNumber: FFFFFFFFFFFFFFFF > [ 115.779381] usb-storage 2-1.4:1.0: USB Mass Storage device detected > [ 115.779821] scsi host4: usb-storage 2-1.4:1.0 > [ 115.779917] usbcore: registered new interface driver usb-storage > [ 115.787770] usbcore: registered new interface driver uas > [ 116.646327] usbcore: registered new interface driver cdc_ether > [ 116.655897] usbcore: registered new interface driver cdc_ncm > [ 116.665733] usbcore: registered new interface driver cdc_wdm > [ 116.706710] cdc_mbim 2-1.4:2.0: SET_NTB_FORMAT failed > [ 116.730917] cdc_mbim 2-1.4:2.0: bind() failure > [ 116.730987] usbcore: registered new interface driver cdc_mbim > [ 116.935660] usb 2-1.4: USB disconnect, device number 7 > [ 121.459317] usb 2-1.4: new high-speed USB device number 8 using ehci-pci > [ 121.539511] usb 2-1.4: New USB device found, idVendor=12d1, idProduct=1f1c, bcdDevice= 1.02 > [ 121.539520] usb 2-1.4: New USB device strings: Mfr=1, Product=2, SerialNumber=3 > [ 121.539525] usb 2-1.4: Product: HUAWEI Mobile > [ 121.539528] usb 2-1.4: Manufacturer: Vodafone(Huawei) > [ 121.539531] usb 2-1.4: SerialNumber: FFFFFFFFFFFFFFFF > [ 121.594546] usb-storage 2-1.4:1.0: USB Mass Storage device detected > [ 121.594911] scsi host4: usb-storage 2-1.4:1.0 > [ 122.466808] cdc_mbim 2-1.4:2.0: SET_NTB_FORMAT failed > [ 122.490514] cdc_mbim 2-1.4:2.0: bind() failure > [ 122.567541] usb 2-1.4: USB disconnect, device number 8 > [ 127.091345] usb 2-1.4: new high-speed USB device number 9 using ehci-pci > [ 127.172930] usb 2-1.4: New USB device found, idVendor=12d1, idProduct=1f1c, bcdDevice= 1.02 > [ 127.172939] usb 2-1.4: New USB device strings: Mfr=1, Product=2, SerialNumber=3 > [ 127.172943] usb 2-1.4: Product: HUAWEI Mobile > [ 127.172947] usb 2-1.4: Manufacturer: Vodafone(Huawei) > [ 127.172949] usb 2-1.4: SerialNumber: FFFFFFFFFFFFFFFF > [ 127.226234] usb-storage 2-1.4:1.0: USB Mass Storage device detected > [ 127.226706] scsi host4: usb-storage 2-1.4:1.0 > [ 128.090497] cdc_mbim 2-1.4:2.0: SET_NTB_FORMAT failed > [ 128.114422] cdc_mbim 2-1.4:2.0: bind() failure > [ 128.199565] usb 2-1.4: USB disconnect, device number 9 > > /var/lib/messages: > Aug 7 17:59:49 localhost kernel: usb 2-1.4: Product: HUAWEI Mobile > Aug 7 17:59:49 localhost kernel: usb 2-1.4: Manufacturer: Vodafone(Huawei) > Aug 7 17:59:49 localhost kernel: usb 2-1.4: SerialNumber: FFFFFFFFFFFFFFFF > Aug 7 17:59:49 localhost mtp-probe[1531]: checking bus 2, device 7: "/sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.4" > Aug 7 17:59:49 localhost mtp-probe[1531]: bus: 2, device: 7 was not an MTP device > Aug 7 17:59:49 localhost systemd[1]: Created slice system-usb_modeswitch.slice - Slice /system/usb_modeswitch. > Aug 7 17:59:49 localhost systemd[1]: Starting usb_modeswitch@2-1.4:1.0.service - USB_ModeSwitch_2-1.4:1.0... > Aug 7 17:59:49 localhost kernel: usb-storage 2-1.4:1.0: USB Mass Storage device detected > Aug 7 17:59:49 localhost kernel: scsi host4: usb-storage 2-1.4:1.0 > Aug 7 17:59:49 localhost kernel: usbcore: registered new interface driver usb-storage > Aug 7 17:59:49 localhost kernel: usbcore: registered new interface driver uas > Aug 7 17:59:49 localhost mtp-probe[1546]: checking bus 2, device 7: "/sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.4" > Aug 7 17:59:49 localhost mtp-probe[1546]: bus: 2, device: 7 was not an MTP device > Aug 7 17:59:50 localhost usb_modeswitch[1551]: switch device 12d1:1f1c on 002/007 > Aug 7 17:59:50 localhost kernel: usbcore: registered new interface driver cdc_ether > Aug 7 17:59:50 localhost kernel: usbcore: registered new interface driver cdc_ncm > Aug 7 17:59:50 localhost kernel: usbcore: registered new interface driver cdc_wdm > Aug 7 17:59:50 localhost kernel: cdc_mbim 2-1.4:2.0: SET_NTB_FORMAT failed > Aug 7 17:59:50 localhost kernel: cdc_mbim 2-1.4:2.0: bind() failure > Aug 7 17:59:50 localhost kernel: usbcore: registered new interface driver cdc_mbim > Aug 7 17:59:50 localhost kernel: usb 2-1.4: USB disconnect, device number 7 > Aug 7 17:59:55 localhost kernel: usb 2-1.4: new high-speed USB device number 8 using ehci-pci > Aug 7 17:59:55 localhost kernel: usb 2-1.4: New USB device found, idVendor=12d1, idProduct=1f1c, bcdDevice= 1.02 > Aug 7 17:59:55 localhost kernel: usb 2-1.4: New USB device strings: Mfr=1, Product=2, SerialNumber=3 > Aug 7 17:59:55 localhost kernel: usb 2-1.4: Product: HUAWEI Mobile > Aug 7 17:59:55 localhost kernel: usb 2-1.4: Manufacturer: Vodafone(Huawei) > Aug 7 17:59:55 localhost kernel: usb 2-1.4: SerialNumber: FFFFFFFFFFFFFFFF > Aug 7 17:59:55 localhost kernel: usb-storage 2-1.4:1.0: USB Mass Storage device detected > Aug 7 17:59:55 localhost kernel: scsi host4: usb-storage 2-1.4:1.0 > Aug 7 17:59:55 localhost mtp-probe[1565]: checking bus 2, device 8: "/sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.4" > Aug 7 17:59:55 localhost mtp-probe[1565]: bus: 2, device: 8 was not an MTP device > Aug 7 17:59:55 localhost systemd[1]: usb_modeswitch@2-1.4:1.0.service: Main process exited, code=killed, status=15/TERM > Aug 7 17:59:55 localhost systemd[1]: usb_modeswitch@2-1.4:1.0.service: Failed with result 'signal'. > Aug 7 17:59:55 localhost systemd[1]: Stopped usb_modeswitch@2-1.4:1.0.service - USB_ModeSwitch_2-1.4:1.0. > Aug 7 17:59:55 localhost audit[1]: SERVICE_START pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=usb_modeswitch@2-1.4:1.0 comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=failed' > Aug 7 17:59:55 localhost systemd[1]: Starting usb_modeswitch@2-1.4:1.0.service - USB_ModeSwitch_2-1.4:1.0... > Aug 7 17:59:55 localhost mtp-probe[1575]: checking bus 2, device 8: "/sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.4" > Aug 7 17:59:55 localhost mtp-probe[1575]: bus: 2, device: 8 was not an MTP device > Aug 7 17:59:55 localhost usb_modeswitch[1579]: switch device 12d1:1f1c on 002/008 > Aug 7 17:59:56 localhost kernel: cdc_mbim 2-1.4:2.0: SET_NTB_FORMAT failed > Aug 7 17:59:56 localhost kernel: cdc_mbim 2-1.4:2.0: bind() failure > Aug 7 17:59:56 localhost kernel: usb 2-1.4: USB disconnect, device number 8 > Aug 7 18:00:00 localhost kernel: usb 2-1.4: new high-speed USB device number 9 using ehci-pci > Aug 7 18:00:00 localhost kernel: usb 2-1.4: New USB device found, idVendor=12d1, idProduct=1f1c, bcdDevice= 1.02 > Aug 7 18:00:00 localhost kernel: usb 2-1.4: New USB device strings: Mfr=1, Product=2, SerialNumber=3 > Aug 7 18:00:00 localhost kernel: usb 2-1.4: Product: HUAWEI Mobile > Aug 7 18:00:00 localhost kernel: usb 2-1.4: Manufacturer: Vodafone(Huawei) > Aug 7 18:00:00 localhost kernel: usb 2-1.4: SerialNumber: FFFFFFFFFFFFFFFF > Aug 7 18:00:01 localhost kernel: usb-storage 2-1.4:1.0: USB Mass Storage device detected > Aug 7 18:00:01 localhost kernel: scsi host4: usb-storage 2-1.4:1.0 > Aug 7 18:00:01 localhost mtp-probe[1586]: checking bus 2, device 9: "/sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.4" > Aug 7 18:00:01 localhost mtp-probe[1586]: bus: 2, device: 9 was not an MTP device > Aug 7 18:00:01 localhost systemd[1]: usb_modeswitch@2-1.4:1.0.service: Main process exited, code=killed, status=15/TERM > Aug 7 18:00:01 localhost systemd[1]: usb_modeswitch@2-1.4:1.0.service: Failed with result 'signal'. > Aug 7 18:00:01 localhost systemd[1]: Stopped usb_modeswitch@2-1.4:1.0.service - USB_ModeSwitch_2-1.4:1.0. > Aug 7 18:00:01 localhost audit[1]: SERVICE_START pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=usb_modeswitch@2-1.4:1.0 comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=failed' > Aug 7 18:00:01 localhost mtp-probe[1594]: checking bus 2, device 9: "/sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.4" > Aug 7 18:00:01 localhost systemd[1]: Starting usb_modeswitch@2-1.4:1.0.service - USB_ModeSwitch_2-1.4:1.0... > Aug 7 18:00:01 localhost mtp-probe[1594]: bus: 2, device: 9 was not an MTP device > Aug 7 18:00:01 localhost usb_modeswitch[1601]: switch device 12d1:1f1c on 002/009 > Aug 7 18:00:01 localhost kernel: cdc_mbim 2-1.4:2.0: SET_NTB_FORMAT failed > Aug 7 18:00:01 localhost kernel: cdc_mbim 2-1.4:2.0: bind() failure > Aug 7 18:00:01 localhost kernel: usb 2-1.4: USB disconnect, device number 9 > Aug 7 18:00:06 localhost kernel: usb 2-1.4: new high-speed USB device number 10 using ehci-pci > Aug 7 18:00:06 localhost kernel: usb 2-1.4: New USB device found, idVendor=12d1, idProduct=1f1c, bcdDevice= 1.02 > Aug 7 18:00:06 localhost kernel: usb 2-1.4: New USB device strings: Mfr=1, Product=2, SerialNumber=3 > Aug 7 18:00:06 localhost kernel: usb 2-1.4: Product: HUAWEI Mobile > Aug 7 18:00:06 localhost kernel: usb 2-1.4: Manufacturer: Vodafone(Huawei) > Aug 7 18:00:06 localhost kernel: usb 2-1.4: SerialNumber: FFFFFFFFFFFFFFFF > Aug 7 18:00:06 localhost kernel: usb-storage 2-1.4:1.0: USB Mass Storage device detected > Aug 7 18:00:06 localhost kernel: scsi host4: usb-storage 2-1.4:1.0 > Aug 7 18:00:06 localhost mtp-probe[1611]: checking bus 2, device 10: "/sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.4" > Aug 7 18:00:06 localhost mtp-probe[1611]: bus: 2, device: 10 was not an MTP device > Aug 7 18:00:06 localhost systemd[1]: usb_modeswitch@2-1.4:1.0.service: Main process exited, code=killed, status=15/TERM > Aug 7 18:00:06 localhost systemd[1]: usb_modeswitch@2-1.4:1.0.service: Failed with result 'signal'. > Aug 7 18:00:06 localhost systemd[1]: Stopped usb_modeswitch@2-1.4:1.0.service - USB_ModeSwitch_2-1.4:1.0. > Aug 7 18:00:06 localhost audit[1]: SERVICE_START pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=usb_modeswitch@2-1.4:1.0 comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=failed' > Aug 7 18:00:06 localhost systemd[1]: Starting usb_modeswitch@2-1.4:1.0.service - USB_ModeSwitch_2-1.4:1.0... > Aug 7 18:00:06 localhost mtp-probe[1620]: checking bus 2, device 10: "/sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.4" > Aug 7 18:00:06 localhost mtp-probe[1620]: bus: 2, device: 10 was not an MTP device > Aug 7 18:00:07 localhost usb_modeswitch[1625]: switch device 12d1:1f1c on 002/010 > Aug 7 18:00:07 localhost kernel: cdc_mbim 2-1.4:2.0: SET_NTB_FORMAT failed > Aug 7 18:00:07 localhost kernel: cdc_mbim 2-1.4:2.0: bind() failure > Aug 7 18:00:07 localhost kernel: usb 2-1.4: USB disconnect, device number 10 > Aug 7 18:00:12 localhost kernel: usb 2-1.4: new high-speed USB device number 11 using ehci-pci > Aug 7 18:00:12 localhost kernel: usb 2-1.4: New USB device found, idVendor=12d1, idProduct=1f1c, bcdDevice= 1.02 > Aug 7 18:00:12 localhost kernel: usb 2-1.4: New USB device strings: Mfr=1, Product=2, SerialNumber=3 > Aug 7 18:00:12 localhost kernel: usb 2-1.4: Product: HUAWEI Mobile > Aug 7 18:00:12 localhost kernel: usb 2-1.4: Manufacturer: Vodafone(Huawei) > Aug 7 18:00:12 localhost kernel: usb 2-1.4: SerialNumber: FFFFFFFFFFFFFFFF > Aug 7 18:00:12 localhost kernel: usb-storage 2-1.4:1.0: USB Mass Storage device detected > Aug 7 18:00:12 localhost kernel: scsi host4: usb-storage 2-1.4:1.0 > Aug 7 18:00:12 localhost mtp-probe[1633]: checking bus 2, device 11: "/sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.4" > Aug 7 18:00:12 localhost mtp-probe[1633]: bus: 2, device: 11 was not an MTP device > Aug 7 18:00:12 localhost systemd[1]: usb_modeswitch@2-1.4:1.0.service: Main process exited, code=killed, status=15/TERM > Aug 7 18:00:12 localhost systemd[1]: usb_modeswitch@2-1.4:1.0.service: Failed with result 'signal'. > Aug 7 18:00:12 localhost systemd[1]: Stopped usb_modeswitch@2-1.4:1.0.service - USB_ModeSwitch_2-1.4:1.0. > Aug 7 18:00:12 localhost audit[1]: SERVICE_START pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=usb_modeswitch@2-1.4:1.0 comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=failed' > Aug 7 18:00:12 localhost systemd[1]: Starting usb_modeswitch@2-1.4:1.0.service - USB_ModeSwitch_2-1.4:1.0... > Aug 7 18:00:12 localhost mtp-probe[1643]: checking bus 2, device 11: "/sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.4" > Aug 7 18:00:12 localhost mtp-probe[1643]: bus: 2, device: 11 was not an MTP device > Aug 7 18:00:12 localhost usb_modeswitch[1647]: switch device 12d1:1f1c on 002/011 > Aug 7 18:00:13 localhost kernel: cdc_mbim 2-1.4:2.0: SET_NTB_FORMAT failed > Aug 7 18:00:13 localhost kernel: cdc_mbim 2-1.4:2.0: bind() failure > Aug 7 18:00:13 localhost kernel: usb 2-1.4: USB disconnect, device number 11 > Aug 7 18:00:17 localhost kernel: usb 2-1.4: new high-speed USB device number 12 using ehci-pci > Aug 7 18:00:17 localhost kernel: usb 2-1.4: New USB device found, idVendor=12d1, idProduct=1f1c, bcdDevice= 1.02 > Aug 7 18:00:17 localhost kernel: usb 2-1.4: New USB device strings: Mfr=1, Product=2, SerialNumber=3 > Aug 7 18:00:17 localhost kernel: usb 2-1.4: Product: HUAWEI Mobile > Aug 7 18:00:17 localhost kernel: usb 2-1.4: Manufacturer: Vodafone(Huawei) > Aug 7 18:00:17 localhost kernel: usb 2-1.4: SerialNumber: FFFFFFFFFFFFFFFF > Aug 7 18:00:17 localhost kernel: usb-storage 2-1.4:1.0: USB Mass Storage device detected > Aug 7 18:00:17 localhost kernel: scsi host4: usb-storage 2-1.4:1.0 > Aug 7 18:00:17 localhost mtp-probe[1654]: checking bus 2, device 12: "/sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.4" > Aug 7 18:00:17 localhost mtp-probe[1654]: bus: 2, device: 12 was not an MTP device > Aug 7 18:00:17 localhost systemd[1]: usb_modeswitch@2-1.4:1.0.service: Main process exited, code=killed, status=15/TERM > Aug 7 18:00:17 localhost systemd[1]: usb_modeswitch@2-1.4:1.0.service: Failed with result 'signal'. > Aug 7 18:00:17 localhost systemd[1]: Stopped usb_modeswitch@2-1.4:1.0.service - USB_ModeSwitch_2-1.4:1.0. > Aug 7 18:00:17 localhost audit[1]: SERVICE_START pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=usb_modeswitch@2-1.4:1.0 comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=failed' > Aug 7 18:00:17 localhost systemd[1]: Starting usb_modeswitch@2-1.4:1.0.service - USB_ModeSwitch_2-1.4:1.0... > Aug 7 18:00:17 localhost mtp-probe[1663]: checking bus 2, device 12: "/sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.4" > Aug 7 18:00:17 localhost mtp-probe[1663]: bus: 2, device: 12 was not an MTP device > Aug 7 18:00:18 localhost usb_modeswitch[1668]: switch device 12d1:1f1c on 002/012 > Aug 7 18:00:18 localhost kernel: cdc_mbim 2-1.4:2.0: SET_NTB_FORMAT failed > Aug 7 18:00:18 localhost kernel: cdc_mbim 2-1.4:2.0: bind() failure > Aug 7 18:00:18 localhost kernel: usb 2-1.4: USB disconnect, device number 12 > Aug 7 18:00:25 localhost kernel: usb 2-1.4: new high-speed USB device number 13 using ehci-pci > Aug 7 18:00:25 localhost kernel: usb 2-1.4: New USB device found, idVendor=12d1, idProduct=14fb, bcdDevice= 1.02 > Aug 7 18:00:25 localhost kernel: usb 2-1.4: New USB device strings: Mfr=2, Product=1, SerialNumber=0 > Aug 7 18:00:25 localhost kernel: usb 2-1.4: Product: HUAWEI Mobile > Aug 7 18:00:25 localhost kernel: usb 2-1.4: Manufacturer: HUAWEI Technology > Aug 7 18:00:25 localhost mtp-probe[1672]: checking bus 2, device 13: "/sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.4" > Aug 7 18:00:25 localhost mtp-probe[1672]: bus: 2, device: 13 was not an MTP device > Aug 7 18:00:25 localhost kernel: usbcore: registered new interface driver option > Aug 7 18:00:25 localhost kernel: usbserial: USB Serial support registered for GSM modem (1-port) > Aug 7 18:00:25 localhost kernel: option 2-1.4:1.0: GSM modem (1-port) converter detected > Aug 7 18:00:25 localhost kernel: usb 2-1.4: GSM modem (1-port) converter now attached to ttyUSB0 > Aug 7 18:00:25 localhost kernel: option 2-1.4:1.1: GSM modem (1-port) converter detected > Aug 7 18:00:25 localhost kernel: usb 2-1.4: GSM modem (1-port) converter now attached to ttyUSB1 > Aug 7 18:00:25 localhost mtp-probe[1679]: checking bus 2, device 13: "/sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.4" > Aug 7 18:00:25 localhost mtp-probe[1679]: bus: 2, device: 13 was not an MTP device > Aug 7 18:00:38 localhost systemd[1]: usb_modeswitch@2-1.4:1.0.service: Deactivated successfully. > Aug 7 18:00:38 localhost systemd[1]: Finished usb_modeswitch@2-1.4:1.0.service - USB_ModeSwitch_2-1.4:1.0. > Aug 7 18:00:38 localhost audit[1]: SERVICE_START pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=usb_modeswitch@2-1.4:1.0 comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success' > Aug 7 18:00:38 localhost audit[1]: SERVICE_STOP pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=usb_modeswitch@2-1.4:1.0 comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success' > Aug 7 18:00:48 localhost systemd[1149]: Starting grub-boot-success.service - Mark boot as successful... > Aug 7 18:00:48 localhost systemd[1149]: Finished grub-boot-success.service - Mark boot as successful. > Aug 7 18:00:57 localhost ModemManager[936]: <info> [device /sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.4] creating modem with plugin 'huawei' and '2' ports > Aug 7 18:00:57 localhost ModemManager[936]: <warn> [plugin/huawei] could not grab port ttyUSB0: Cannot add port 'tty/ttyUSB0', unhandled port type > Aug 7 18:00:57 localhost ModemManager[936]: <warn> [plugin/huawei] could not grab port ttyUSB1: Cannot add port 'tty/ttyUSB1', unhandled port type > Aug 7 18:00:57 localhost ModemManager[936]: <warn> [base-manager] couldn't create modem for device '/sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.4': Failed to find primary AT port See the ticket for details and further comments. @S.Bonomar FYI: you might need to bisect this issue to get us to the root of the problem. I also wonder if you used a vanilla 4.15 version or Ubuntu's kernel (which might include a patch to make your device work). But well, maybe the developers have a idea what's wrong here without further debugging. They will know, I have no idea about this driver or how it works. Moving on: If you're among the main recipients of this mail and not just CCed, could you please look into the issue to get it fixed as per https://docs.kernel.org/process/handling-regressions.html ? tia! Anyway, to ensure this is not forgotten lets get this tracked by the the Linux kernel regression tracking bot: #regzbot introduced: v4.15..v4.19 https://bugzilla.kernel.org/show_bug.cgi?id=216336 #regzbot ignore-activity This isn't a regression? This issue or a fix for it are already discussed somewhere else? It was fixed already? You want to clarify when the regression started to happen? Or point out I got the title or something else totally wrong? Then just reply -- ideally with also telling regzbot about it, as explained here: https://linux-regtracking.leemhuis.info/tracked-regression/ Reminder for developers: When fixing the issue, add 'Link:' tags pointing to the report in bugzilla, as the kernel's documentation calls for; above page explains why this is important for tracked regressions. Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat) P.S.: As the Linux kernel's regression tracker I deal with a lot of reports and sometimes miss something important when writing mails like this. If that's the case here, don't hesitate to tell me in a public reply, it's in everyone's interest to set the public record straight.
