Ubuntu 22.04 Sierra EM7455 no GPS/NMEA data over /dev/ttyUSB1

I installed Ubuntu 22.04 on a Lenovo ThinkPad Yoga 370. It contains a LTE with GPS card from Sierra EM7455. I re-configured the EM7455 card to provide a serial GPS/NMEA output. It works just fine if I use Windows 10. The com-Port outputs GPS data.

Unluckily, this is not the case in Ubuntu 22.04, neither in /dev/ttyUSB0 nor /dev/ttyUSB1 nor /dev/ttyUSB2 (which is the modem-configuration in/out that works just fine).

I kindly ask you for support on how I can get GPS/NMEA-Data output on/dev/ttyUSB1.

A connection to the modem to send at-commands back and forth on /dev/ttyUSB2 works just fine. I use the command:

sudo minicom -D /dev/ttyUSB2

for the communication.

Here is some information about my setup:

sudo apt remove gpsdsudo apt remove gpsd-clientssudo apt remove modem-manager-guisystemctl stop ModemManager

(aim was to exclude all interferences from other processes to have the native GPS-data visible on /dev/ttyUSB1).

$ lsusbBus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hubBus 001 Device 006: ID 138a:0097 Validity Sensors, Inc. Bus 001 Device 005: ID 13d3:5682 IMC Networks SunplusIT Integrated CameraBus 001 Device 004: ID 8087:0a2b Intel Corp. Bluetooth wireless interfaceBus 001 Device 003: ID 058f:9540 Alcor Micro Corp. AU9540 Smartcard ReaderBus 001 Device 002: ID 1199:9079 Sierra Wireless, Inc. EM7455Bus 001 Device 007: ID 056a:509c Wacom Co., Ltd Pen and multitouch sensorBus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub$ sudo dmesg | grep ttyUSB[    8.850698] usb 1-2: Qualcomm USB modem converter now attached to ttyUSB0[    8.851173] usb 1-2: Qualcomm USB modem converter now attached to ttyUSB1[    8.942523] usb 1-2: Qualcomm USB modem converter now attached to ttyUSB2[ 1383.674395] audit: type=1400 audit(1659010167.409:228): apparmor="DENIED" operation="open" profile="snap.chromium.chromium" name="/run/udev/data/+usb-serial:ttyUSB1" pid=5750 comm="ThreadPoolForeg" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0[ 1383.674803] audit: type=1400 audit(1659010167.409:229): apparmor="DENIED" operation="open" profile="snap.chromium.chromium" name="/run/udev/data/+usb-serial:ttyUSB2" pid=5750 comm="ThreadPoolForeg" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0[ 1383.675219] audit: type=1400 audit(1659010167.409:230): apparmor="DENIED" operation="open" profile="snap.chromium.chromium" name="/run/udev/data/+usb-serial:ttyUSB0" pid=5750 comm="ThreadPoolForeg" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0$ lsusb -t/:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/6p, 5000M/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/12p, 480M    |__ Port 2: Dev 2, If 2, Class=Vendor Specific Class, Driver=qcserial, 480M    |__ Port 2: Dev 2, If 10, Class=Vendor Specific Class, Driver=qmi_wwan, 480M    |__ Port 2: Dev 2, If 0, Class=Vendor Specific Class, Driver=qcserial, 480M    |__ Port 2: Dev 2, If 3, Class=Vendor Specific Class, Driver=qcserial, 480M    |__ Port 2: Dev 2, If 8, Class=Vendor Specific Class, Driver=qmi_wwan, 480M    |__ Port 5: Dev 3, If 0, Class=Chip/SmartCard, Driver=, 12M    |__ Port 7: Dev 4, If 0, Class=Wireless, Driver=btusb, 12M    |__ Port 7: Dev 4, If 1, Class=Wireless, Driver=btusb, 12M    |__ Port 8: Dev 5, If 1, Class=Video, Driver=uvcvideo, 480M    |__ Port 8: Dev 5, If 0, Class=Video, Driver=uvcvideo, 480M    |__ Port 9: Dev 6, If 0, Class=Vendor Specific Class, Driver=, 12M    |__ Port 10: Dev 7, If 0, Class=Human Interface Device, Driver=usbhid, 12M    |__ Port 10: Dev 7, If 1, Class=Human Interface Device, Driver=usbhid, 12M

Info about the Modem:

It is set to provide serial output of GPS/NMEA-Data. It starts automatically with transmission of ASCII-GPS-Data(receivable in Windows 10, but not when booted with Ubuntu 22.04).

My problem is, that this GPS-Data is not available on/dev/ttyUSB1 (or /dev/ttyUSB0 if at all).

Here is the modem response that shows how I configured it (/dev/ttyUSB2):

ati3Manufacturer: Sierra Wireless, IncorporatedModel: EM7455Revision: SWI9X30C_02.38.00.00 rE3F3E55C03AE94 jenkins 2022/01/13 05:16:00MEID: 01458200734481IMEI: 014582007344816IMEI SV: 22FSN: LF725373650210+GCAP: +CGSMat!usbcomp?Config Index: 1Config Type:  1 (Generic)Interface bitmask: 0000050D (diag,nmea,modem,rmnet0,rmnet1) at!gpsautostart?  function:  1  fixtype: 1  maxtime: 180 seconds  maxdist: 100 meters  fixrate: 1 seconds

Any help is highly appreciated.