Message-ID: <03d0f915-f81e-df57-cc37-7efb82665734@leemhuis.info>
Date:   Wed, 24 Aug 2022 14:24:46 +0200
From:   Thorsten Leemhuis <regressions@...mhuis.info>
To:     Oliver Neukum <oliver@...kum.org>
Cc:     netdev <netdev@...r.kernel.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "regressions@...ts.linux.dev" <regressions@...ts.linux.dev>,
        socratesdevel@...tonmail.com
Subject: Re: [Regression] Bug 216336 - 3G USB Modem Huawei k4203 stop working
 on kernel > 4.X

[reply to self, now with the reporter in CC; sorry for the noise]

On 24.08.22 14:23, Thorsten Leemhuis wrote:
> 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@....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@....4:1.0.service: Main process exited, code=killed, status=15/TERM
>> Aug  7 17:59:55 localhost systemd[1]: usb_modeswitch@....4:1.0.service: Failed with result 'signal'.
>> Aug  7 17:59:55 localhost systemd[1]: Stopped usb_modeswitch@....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@....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@....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@....4:1.0.service: Main process exited, code=killed, status=15/TERM
>> Aug  7 18:00:01 localhost systemd[1]: usb_modeswitch@....4:1.0.service: Failed with result 'signal'.
>> Aug  7 18:00:01 localhost systemd[1]: Stopped usb_modeswitch@....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@....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@....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@....4:1.0.service: Main process exited, code=killed, status=15/TERM
>> Aug  7 18:00:06 localhost systemd[1]: usb_modeswitch@....4:1.0.service: Failed with result 'signal'.
>> Aug  7 18:00:06 localhost systemd[1]: Stopped usb_modeswitch@....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@....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@....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@....4:1.0.service: Main process exited, code=killed, status=15/TERM
>> Aug  7 18:00:12 localhost systemd[1]: usb_modeswitch@....4:1.0.service: Failed with result 'signal'.
>> Aug  7 18:00:12 localhost systemd[1]: Stopped usb_modeswitch@....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@....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@....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@....4:1.0.service: Main process exited, code=killed, status=15/TERM
>> Aug  7 18:00:17 localhost systemd[1]: usb_modeswitch@....4:1.0.service: Failed with result 'signal'.
>> Aug  7 18:00:17 localhost systemd[1]: Stopped usb_modeswitch@....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@....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@....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@....4:1.0.service: Deactivated successfully.
>> Aug  7 18:00:38 localhost systemd[1]: Finished usb_modeswitch@....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@....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@....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.

#regzbot ignore-activity

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