EM9191 truncated AT output with Raspberry Pi4

Hello, I’m trying to use the EM9191 on a Pi4, I managed to made it work on the connection side, but I need to access the SNR, RSSI etc using the AT!Gstatus? command. I made both a script and also tired minimum, and I really can’t understand why sometimes, not always, usually only when I can’t see what I type in the command line tool, the output of the commas I try to read is partial/truncated, as in the picture below

Screenshot 2022-10-18 at 10.29.47

If I unplug and then plug again the modem, sometimes it work, others not.

Any idea?

On windows seems to be fine

Are you using the MBPL driver?

https://source.sierrawireless.com/resources/airprime/software/mbpl/mbpl-software-latest/#sthash.IXg1Vg03.dpbs

I am using the Techship serial driver

I can try these, which is the right version for raspberry pi?

you need to recompile using the Raspberry pi toolchain

I did and I also installed following the readme but now on the serial port it shows me no driver at all

Screenshot 2022-10-18 at 11.12.16

it should be using the driver qcserial for the AT command port

yes … but it does not, any suggestion? I followed the readme file in the MBPL

I suggest you to try with Ubuntu PC first
I can make it work on Ubuntu 18

On Ubuntu and Win it works, but I need it on the Pi unfortunately

does lsmod show the qcserial?

yes, it does. I don’t know what to think about it

have you checked the followings?

owner@ubuntu:~$ lsmod | grep serial
qcserial               24576  0
usb_wwan               20480  1 qcserial
usbserial              45056  2 qcserial,usb_wwan

Yes, here it is

Screenshot 2022-10-18 at 16.10.19

how about dmesg message

how can I use dmesg?

Just type dmesg in console

pi@mig:~ $ dmesg
[    0.000000] Booting Linux on physical CPU 0x0000000000 [0x410fd083]
[    0.000000] Linux version 5.15.61-v8+ (dom@buildbot) (aarch64-linux-gnu-gcc-8 (Ubuntu/Linaro 8.4.0-3ubuntu1) 8.4.0, GNU ld (GNU Binutils for Ubuntu) 2.34) #1579 SMP PREEMPT Fri Aug 26 11:16:44 BST 2022
[    0.000000] random: crng init done
[    0.000000] Machine model: Raspberry Pi 4 Model B Rev 1.1
[    0.000000] efi: UEFI not found.
[    0.000000] Reserved memory: created CMA memory pool at 0x000000001ac00000, size 320 MiB
[    0.000000] OF: reserved mem: initialized node linux,cma, compatible id shared-dma-pool
[    0.000000] Zone ranges:
[    0.000000]   DMA      [mem 0x0000000000000000-0x000000003fffffff]
[    0.000000]   DMA32    [mem 0x0000000040000000-0x000000007fffffff]
[    0.000000]   Normal   empty
[    0.000000] Movable zone start for each node
[    0.000000] Early memory node ranges
[    0.000000]   node   0: [mem 0x0000000000000000-0x000000003b3fffff]
[    0.000000]   node   0: [mem 0x0000000040000000-0x000000007fffffff]
[    0.000000] Initmem setup node 0 [mem 0x0000000000000000-0x000000007fffffff]
[    0.000000] On node 0, zone DMA32: 19456 pages in unavailable ranges
[    0.000000] percpu: Embedded 28 pages/cpu s77272 r8192 d29224 u114688
[    0.000000] pcpu-alloc: s77272 r8192 d29224 u114688 alloc=28*4096
[    0.000000] pcpu-alloc: [0] 0 [0] 1 [0] 2 [0] 3 
[    0.000000] Detected PIPT I-cache on CPU0
[    0.000000] CPU features: detected: Spectre-v2
[    0.000000] CPU features: detected: Spectre-v3a
[    0.000000] CPU features: detected: Spectre-v4
[    0.000000] CPU features: detected: Spectre-BHB
[    0.000000] CPU features: kernel page table isolation forced ON by KASLR
[    0.000000] CPU features: detected: Kernel page table isolation (KPTI)
[    0.000000] CPU features: detected: ARM errata 1165522, 1319367, or 1530923
[    0.000000] Built 1 zonelists, mobility grouping on.  Total pages: 496944
[    0.000000] Kernel command line: coherent_pool=1M 8250.nr_uarts=0 snd_bcm2835.enable_compat_alsa=0 snd_bcm2835.enable_hdmi=1  smsc95xx.macaddr=DC:A6:32:2B:93:C7 vc_mem.mem_base=0x3ec00000 vc_mem.mem_size=0x40000000  console=ttyS0,115200 console=tty1 root=PARTUUID=97252d71-02 rootfstype=ext4 fsck.repair=yes rootwait quiet splash plymouth.ignore-serial-consoles
[    0.000000] Unknown kernel command line parameters "splash", will be passed to user space.
[    0.000000] Dentry cache hash table entries: 262144 (order: 9, 2097152 bytes, linear)
[    0.000000] Inode-cache hash table entries: 131072 (order: 8, 1048576 bytes, linear)
[    0.000000] mem auto-init: stack:off, heap alloc:off, heap free:off
[    0.000000] software IO TLB: mapped [mem 0x0000000037400000-0x000000003b400000] (64MB)
[    0.000000] Memory: 1562108K/2019328K available (11520K kernel code, 1956K rwdata, 4140K rodata, 3840K init, 974K bss, 129540K reserved, 327680K cma-reserved)
[    0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=4, Nodes=1
[    0.000000] ftrace: allocating 38040 entries in 149 pages
[    0.000000] ftrace: allocated 149 pages with 4 groups
[    0.000000] trace event string verifier disabled
[    0.000000] rcu: Preemptible hierarchical RCU implementation.
[    0.000000] rcu: 	RCU event tracing is enabled.
[    0.000000] rcu: 	RCU restricting CPUs from NR_CPUS=256 to nr_cpu_ids=4.
[    0.000000] 	Trampoline variant of Tasks RCU enabled.
[    0.000000] 	Rude variant of Tasks RCU enabled.
[    0.000000] 	Tracing variant of Tasks RCU enabled.
[    0.000000] rcu: RCU calculated value of scheduler-enlistment delay is 25 jiffies.
[    0.000000] rcu: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=4
[    0.000000] NR_IRQS: 64, nr_irqs: 64, preallocated irqs: 0
[    0.000000] Root IRQ handler: gic_handle_irq
[    0.000000] GIC: Using split EOI/Deactivate mode
[    0.000000] irq_brcmstb_l2: registered L2 intc (/soc/interrupt-controller@7ef00100, parent irq: 10)
[    0.000000] arch_timer: cp15 timer(s) running at 54.00MHz (phys).
[    0.000000] clocksource: arch_sys_counter: mask: 0xffffffffffffff max_cycles: 0xc743ce346, max_idle_ns: 440795203123 ns
[    0.000001] sched_clock: 56 bits at 54MHz, resolution 18ns, wraps every 4398046511102ns
[    0.000308] Console: colour dummy device 80x25
[    0.000362] printk: console [tty1] enabled
[    0.000424] Calibrating delay loop (skipped), value calculated using timer frequency.. 108.00 BogoMIPS (lpj=216000)
[    0.000449] pid_max: default: 32768 minimum: 301
[    0.000592] LSM: Security Framework initializing
[    0.000789] Mount-cache hash table entries: 4096 (order: 3, 32768 bytes, linear)
[    0.000831] Mountpoint-cache hash table entries: 4096 (order: 3, 32768 bytes, linear)
[    0.002065] cgroup: Disabling memory control group subsystem
[    0.004699] rcu: Hierarchical SRCU implementation.
[    0.005779] EFI services will not be available.
[    0.006293] smp: Bringing up secondary CPUs ...
[    0.007331] Detected PIPT I-cache on CPU1
[    0.007409] CPU1: Booted secondary processor 0x0000000001 [0x410fd083]
[    0.008658] Detected PIPT I-cache on CPU2
[    0.008709] CPU2: Booted secondary processor 0x0000000002 [0x410fd083]
[    0.009829] Detected PIPT I-cache on CPU3
[    0.009878] CPU3: Booted secondary processor 0x0000000003 [0x410fd083]
[    0.010029] smp: Brought up 1 node, 4 CPUs
[    0.010049] SMP: Total of 4 processors activated.
[    0.010061] CPU features: detected: 32-bit EL0 Support
[    0.010071] CPU features: detected: 32-bit EL1 Support
[    0.010084] CPU features: detected: CRC32 instructions
[    0.041499] CPU: All CPU(s) started at EL2
[    0.041573] alternatives: patching kernel code
[    0.043024] devtmpfs: initialized
[    0.053692] Enabled cp15_barrier support
[    0.053734] Enabled setend support
[    0.053753] KASLR enabled
[    0.053936] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 7645041785100000 ns
[    0.053970] futex hash table entries: 1024 (order: 4, 65536 bytes, linear)
[    0.062394] pinctrl core: initialized pinctrl subsystem
[    0.063175] DMI not present or invalid.
[    0.063865] NET: Registered PF_NETLINK/PF_ROUTE protocol family
[    0.067552] DMA: preallocated 1024 KiB GFP_KERNEL pool for atomic allocations
[    0.067850] DMA: preallocated 1024 KiB GFP_KERNEL|GFP_DMA pool for atomic allocations
[    0.068785] DMA: preallocated 1024 KiB GFP_KERNEL|GFP_DMA32 pool for atomic allocations
[    0.068885] audit: initializing netlink subsys (disabled)
[    0.069173] audit: type=2000 audit(0.068:1): state=initialized audit_enabled=0 res=1
[    0.069699] thermal_sys: Registered thermal governor 'step_wise'
[    0.069924] cpuidle: using governor menu
[    0.070251] hw-breakpoint: found 6 breakpoint and 4 watchpoint registers.
[    0.070447] ASID allocator initialised with 32768 entries
[    0.070603] Serial: AMBA PL011 UART driver
[    0.082989] bcm2835-mbox fe00b880.mailbox: mailbox enabled
[    0.108367] raspberrypi-firmware soc:firmware: Attached to firmware from 2022-08-26T14:03:16, variant start
[    0.112385] raspberrypi-firmware soc:firmware: Firmware hash is 102f1e848393c2112206fadffaaf86db04e98326
[    0.162773] bcm2835-dma fe007000.dma: DMA legacy API manager, dmachans=0x1
[    0.166923] vgaarb: loaded
[    0.167323] SCSI subsystem initialized
[    0.167543] usbcore: registered new interface driver usbfs
[    0.167594] usbcore: registered new interface driver hub
[    0.167669] usbcore: registered new device driver usb
[    0.168019] usb_phy_generic phy: supply vcc not found, using dummy regulator
[    0.168220] usb_phy_generic phy: dummy supplies not allowed for exclusive requests
[    0.168496] pps_core: LinuxPPS API ver. 1 registered
[    0.168509] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti@linux.it>
[    0.168530] PTP clock support registered
[    0.170107] clocksource: Switched to clocksource arch_sys_counter
[    0.258635] VFS: Disk quotas dquot_6.6.0
[    0.258736] VFS: Dquot-cache hash table entries: 512 (order 0, 4096 bytes)
[    0.258902] FS-Cache: Loaded
[    0.259144] CacheFiles: Loaded
[    0.269897] NET: Registered PF_INET protocol family
[    0.270249] IP idents hash table entries: 32768 (order: 6, 262144 bytes, linear)
[    0.272148] tcp_listen_portaddr_hash hash table entries: 1024 (order: 2, 16384 bytes, linear)
[    0.272186] Table-perturb hash table entries: 65536 (order: 6, 262144 bytes, linear)
[    0.272209] TCP established hash table entries: 16384 (order: 5, 131072 bytes, linear)
[    0.272319] TCP bind hash table entries: 16384 (order: 6, 262144 bytes, linear)
[    0.272568] TCP: Hash tables configured (established 16384 bind 16384)
[    0.272783] UDP hash table entries: 1024 (order: 3, 32768 bytes, linear)
[    0.272829] UDP-Lite hash table entries: 1024 (order: 3, 32768 bytes, linear)
[    0.273071] NET: Registered PF_UNIX/PF_LOCAL protocol family
[    0.274129] RPC: Registered named UNIX socket transport module.
[    0.274149] RPC: Registered udp transport module.
[    0.274159] RPC: Registered tcp transport module.
[    0.274169] RPC: Registered tcp NFSv4.1 backchannel transport module.
[    0.274189] PCI: CLS 0 bytes, default 64
[    0.276843] hw perfevents: enabled with armv8_cortex_a72 PMU driver, 7 counters available
[    0.277158] kvm [1]: IPA Size Limit: 44 bits
[    0.278359] kvm [1]: vgic interrupt IRQ9
[    0.278626] kvm [1]: Hyp mode initialized successfully
[    1.087868] Initialise system trusted keyrings
[    1.088267] workingset: timestamp_bits=46 max_order=19 bucket_order=0
[    1.095050] zbud: loaded
[    1.096884] FS-Cache: Netfs 'nfs' registered for caching
[    1.097540] NFS: Registering the id_resolver key type
[    1.097587] Key type id_resolver registered
[    1.097598] Key type id_legacy registered
[    1.097703] nfs4filelayout_init: NFSv4 File Layout Driver Registering...
[    1.097717] nfs4flexfilelayout_init: NFSv4 Flexfile Layout Driver Registering...
[    1.098986] Key type asymmetric registered
[    1.099004] Asymmetric key parser 'x509' registered
[    1.099085] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 247)
[    1.099344] io scheduler mq-deadline registered
[    1.099359] io scheduler kyber registered
[    1.107596] brcm-pcie fd500000.pcie: host bridge /scb/pcie@7d500000 ranges:
[    1.107641] brcm-pcie fd500000.pcie:   No bus range found for /scb/pcie@7d500000, using [bus 00-ff]
[    1.107724] brcm-pcie fd500000.pcie:      MEM 0x0600000000..0x063fffffff -> 0x00c0000000
[    1.107805] brcm-pcie fd500000.pcie:   IB MEM 0x0000000000..0x007fffffff -> 0x0400000000
[    1.156203] brcm-pcie fd500000.pcie: link up, 5.0 GT/s PCIe x1 (SSC)
[    1.156560] brcm-pcie fd500000.pcie: PCI host bridge to bus 0000:00
[    1.156578] pci_bus 0000:00: root bus resource [bus 00-ff]
[    1.156596] pci_bus 0000:00: root bus resource [mem 0x600000000-0x63fffffff] (bus address [0xc0000000-0xffffffff])
[    1.156681] pci 0000:00:00.0: [14e4:2711] type 01 class 0x060400
[    1.156926] pci 0000:00:00.0: PME# supported from D0 D3hot
[    1.160681] pci 0000:00:00.0: bridge configuration invalid ([bus 00-00]), reconfiguring
[    1.161031] pci 0000:01:00.0: [1106:3483] type 00 class 0x0c0330
[    1.161154] pci 0000:01:00.0: reg 0x10: [mem 0x00000000-0x00000fff 64bit]
[    1.161574] pci 0000:01:00.0: PME# supported from D0 D3cold
[    1.177466] pci_bus 0000:01: busn_res: [bus 01-ff] end is updated to 01
[    1.177514] pci 0000:00:00.0: BAR 8: assigned [mem 0x600000000-0x6000fffff]
[    1.177536] pci 0000:01:00.0: BAR 0: assigned [mem 0x600000000-0x600000fff 64bit]
[    1.177576] pci 0000:00:00.0: PCI bridge to [bus 01]
[    1.177596] pci 0000:00:00.0:   bridge window [mem 0x600000000-0x6000fffff]
[    1.189340] iproc-rng200 fe104000.rng: hwrng registered
[    1.189807] vc-mem: phys_addr:0x00000000 mem_base=0x3ec00000 mem_size:0x40000000(1024 MiB)
[    1.191256] gpiomem-bcm2835 fe200000.gpiomem: Initialised: Registers at 0xfe200000
[    1.203713] brd: module loaded
[    1.213264] loop: module loaded
[    1.214014] Loading iSCSI transport class v2.0-870.
[    1.219029] bcmgenet fd580000.ethernet: GENET 5.0 EPHY: 0x0000
[    1.278267] unimac-mdio unimac-mdio.-19: Broadcom UniMAC MDIO bus
[    1.279381] usbcore: registered new interface driver r8152
[    1.279445] usbcore: registered new interface driver lan78xx
[    1.279497] usbcore: registered new interface driver smsc95xx
[    1.281053] pci 0000:00:00.0: enabling device (0000 -> 0002)
[    1.281091] xhci_hcd 0000:01:00.0: enabling device (0000 -> 0002)
[    1.281187] xhci_hcd 0000:01:00.0: xHCI Host Controller
[    1.281218] xhci_hcd 0000:01:00.0: new USB bus registered, assigned bus number 1
[    1.282017] xhci_hcd 0000:01:00.0: hcc params 0x002841eb hci version 0x100 quirks 0x00003c0000000890
[    1.282725] xhci_hcd 0000:01:00.0: xHCI Host Controller
[    1.282748] xhci_hcd 0000:01:00.0: new USB bus registered, assigned bus number 2
[    1.282770] xhci_hcd 0000:01:00.0: Host supports USB 3.0 SuperSpeed
[    1.283174] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 5.15
[    1.283195] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[    1.283210] usb usb1: Product: xHCI Host Controller
[    1.283223] usb usb1: Manufacturer: Linux 5.15.61-v8+ xhci-hcd
[    1.283235] usb usb1: SerialNumber: 0000:01:00.0
[    1.283928] hub 1-0:1.0: USB hub found
[    1.284024] hub 1-0:1.0: 1 port detected
[    1.285014] usb usb2: New USB device found, idVendor=1d6b, idProduct=0003, bcdDevice= 5.15
[    1.285036] usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[    1.285050] usb usb2: Product: xHCI Host Controller
[    1.285063] usb usb2: Manufacturer: Linux 5.15.61-v8+ xhci-hcd
[    1.285075] usb usb2: SerialNumber: 0000:01:00.0
[    1.285713] hub 2-0:1.0: USB hub found
[    1.285785] hub 2-0:1.0: 4 ports detected
[    1.287457] dwc_otg: version 3.00a 10-AUG-2012 (platform bus)
[    1.287756] dwc_otg: FIQ enabled
[    1.287767] dwc_otg: NAK holdoff enabled
[    1.287776] dwc_otg: FIQ split-transaction FSM enabled
[    1.287789] Module dwc_common_port init
[    1.288333] usbcore: registered new interface driver uas
[    1.288444] usbcore: registered new interface driver usb-storage
[    1.288647] mousedev: PS/2 mouse device common for all mice
[    1.293741] sdhci: Secure Digital Host Controller Interface driver
[    1.293759] sdhci: Copyright(c) Pierre Ossman
[    1.294420] sdhci-pltfm: SDHCI platform and OF driver helper
[    1.297933] ledtrig-cpu: registered to indicate activity on CPUs
[    1.298562] hid: raw HID events driver (C) Jiri Kosina
[    1.298718] usbcore: registered new interface driver usbhid
[    1.298731] usbhid: USB HID core driver
[    1.299041] ashmem: initialized
[    1.307640] NET: Registered PF_PACKET protocol family
[    1.307771] Key type dns_resolver registered
[    1.308961] registered taskstats version 1
[    1.308999] Loading compiled-in X.509 certificates
[    1.309635] Key type ._fscrypt registered
[    1.309650] Key type .fscrypt registered
[    1.309660] Key type fscrypt-provisioning registered
[    1.321276] uart-pl011 fe201000.serial: there is not valid maps for state default
[    1.321564] uart-pl011 fe201000.serial: cts_event_workaround enabled
[    1.321738] fe201000.serial: ttyAMA0 at MMIO 0xfe201000 (irq = 19, base_baud = 0) is a PL011 rev2
[    1.330693] bcm2835-wdt bcm2835-wdt: Broadcom BCM2835 watchdog timer
[    1.331177] bcm2835-power bcm2835-power: Broadcom BCM2835 power domains driver
[    1.332343] mmc-bcm2835 fe300000.mmcnr: mmc_debug:0 mmc_debug2:0
[    1.332362] mmc-bcm2835 fe300000.mmcnr: DMA channel allocated
[    1.364071] of_cfs_init
[    1.364206] of_cfs_init: OK
[    1.397365] mmc0: SDHCI controller on fe340000.mmc [fe340000.mmc] using ADMA
[    1.398031] Waiting for root device PARTUUID=97252d71-02...
[    1.467367] mmc1: new high speed SDIO card at address 0001
[    1.496608] mmc0: new ultra high speed DDR50 SDXC card at address 5048
[    1.497637] mmcblk0: mmc0:5048 MC43A 57.9 GiB 
[    1.501043]  mmcblk0: p1 p2
[    1.501605] mmcblk0: mmc0:5048 MC43A 57.9 GiB
[    1.525845] EXT4-fs (mmcblk0p2): mounted filesystem with ordered data mode. Opts: (null). Quota mode: none.
[    1.525953] VFS: Mounted root (ext4 filesystem) readonly on device 179:2.
[    1.528099] devtmpfs: mounted
[    1.535796] Freeing unused kernel memory: 3840K
[    1.536007] Run /sbin/init as init process
[    1.536018]   with arguments:
[    1.536026]     /sbin/init
[    1.536036]     splash
[    1.536045]   with environment:
[    1.536054]     HOME=/
[    1.536062]     TERM=linux
[    1.538191] usb 1-1: new high-speed USB device number 2 using xhci_hcd
[    1.688846] usb 1-1: New USB device found, idVendor=2109, idProduct=3431, bcdDevice= 4.21
[    1.688883] usb 1-1: New USB device strings: Mfr=0, Product=1, SerialNumber=0
[    1.688899] usb 1-1: Product: USB2.0 Hub
[    1.691387] hub 1-1:1.0: USB hub found
[    1.691666] hub 1-1:1.0: 4 ports detected
[    1.917410] systemd[1]: System time before build time, advancing clock.
[    2.113372] NET: Registered PF_INET6 protocol family
[    2.115287] Segment Routing with IPv6
[    2.115328] In-situ OAM (IOAM) with IPv6
[    2.194257] systemd[1]: systemd 247.3-7+deb11u1 running in system mode. (+PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ +LZ4 +ZSTD +SECCOMP +BLKID +ELFUTILS +KMOD +IDN2 -IDN +PCRE2 default-hierarchy=unified)
[    2.195235] systemd[1]: Detected architecture arm64.
[    2.200163] systemd[1]: Set hostname to <mig>.
[    2.839524] systemd[1]: /lib/systemd/system/plymouth-start.service:16: Unit configured to use KillMode=none. This is unsafe, as it disables systemd's process lifecycle management for the service. Please update your service to use a safer KillMode=, such as 'mixed' or 'control-group'. Support for KillMode=none is deprecated and will eventually be removed.
[    2.998013] systemd[1]: Queued start job for default target Graphical Interface.
[    3.003912] systemd[1]: Created slice system-getty.slice.
[    3.005177] systemd[1]: Created slice system-modprobe.slice.
[    3.006209] systemd[1]: Created slice system-systemd\x2dfsck.slice.
[    3.007005] systemd[1]: Created slice User and Session Slice.
[    3.007542] systemd[1]: Started Forward Password Requests to Wall Directory Watch.
[    3.008650] systemd[1]: Set up automount Arbitrary Executable File Formats File System Automount Point.
[    3.009124] systemd[1]: Reached target Slices.
[    3.009256] systemd[1]: Reached target Swap.
[    3.013984] systemd[1]: Listening on Syslog Socket.
[    3.014778] systemd[1]: Listening on fsck to fsckd communication Socket.
[    3.015160] systemd[1]: Listening on initctl Compatibility Named Pipe.
[    3.016619] systemd[1]: Listening on Journal Audit Socket.
[    3.017443] systemd[1]: Listening on Journal Socket (/dev/log).
[    3.018498] systemd[1]: Listening on Journal Socket.
[    3.020356] systemd[1]: Listening on udev Control Socket.
[    3.021143] systemd[1]: Listening on udev Kernel Socket.
[    3.022195] systemd[1]: Condition check resulted in Huge Pages File System being skipped.
[    3.026200] systemd[1]: Mounting POSIX Message Queue File System...
[    3.030636] systemd[1]: Mounting RPC Pipe File System...
[    3.036308] systemd[1]: Mounting Kernel Debug File System...
[    3.041732] systemd[1]: Mounting Kernel Trace File System...
[    3.042674] systemd[1]: Condition check resulted in Kernel Module supporting RPCSEC_GSS being skipped.
[    3.050171] systemd[1]: Starting Restore / save the current clock...
[    3.055534] systemd[1]: Starting Set the console keyboard layout...
[    3.060801] systemd[1]: Starting Create list of static device nodes for the current kernel...
[    3.066373] systemd[1]: Starting Load Kernel Module configfs...
[    3.072560] systemd[1]: Starting Load Kernel Module drm...
[    3.078530] systemd[1]: Starting Load Kernel Module fuse...
[    3.082253] systemd[1]: Condition check resulted in Set Up Additional Binary Formats being skipped.
[    3.087848] systemd[1]: Starting File System Check on Root Device...
[    3.098870] systemd[1]: Starting Journal Service...
[    3.110919] systemd[1]: Starting Load Kernel Modules...
[    3.116891] systemd[1]: Starting Coldplug All udev Devices...
[    3.144763] systemd[1]: Mounted POSIX Message Queue File System.
[    3.147170] systemd[1]: Mounted RPC Pipe File System.
[    3.148011] systemd[1]: Mounted Kernel Debug File System.
[    3.153078] systemd[1]: Mounted Kernel Trace File System.
[    3.158760] systemd[1]: Finished Restore / save the current clock.
[    3.164160] systemd[1]: Finished Create list of static device nodes for the current kernel.
[    3.166868] systemd[1]: modprobe@configfs.service: Succeeded.
[    3.168360] systemd[1]: Finished Load Kernel Module configfs.
[    3.182806] systemd[1]: Mounting Kernel Configuration File System...
[    3.189155] systemd[1]: Started File System Check Daemon to report status.
[    3.199869] fuse: init (API version 7.34)
[    3.222520] i2c_dev: i2c /dev entries driver
[    3.228819] systemd[1]: modprobe@fuse.service: Succeeded.
[    3.230689] systemd[1]: Finished Load Kernel Module fuse.
[    3.231931] systemd[1]: Mounted Kernel Configuration File System.
[    3.239780] systemd[1]: Mounting FUSE Control File System...
[    3.252199] usbcore: registered new interface driver usbserial_generic
[    3.252275] usbserial: USB Serial support registered for generic
[    3.265698] systemd[1]: Mounted FUSE Control File System.
[    3.280259] usbcore: registered new interface driver qcserial
[    3.280368] usbserial: USB Serial support registered for Qualcomm USB modem
[    3.289081] systemd[1]: Finished Load Kernel Modules.
[    3.294367] systemd[1]: Starting Apply Kernel Variables...
[    3.315027] systemd[1]: modprobe@drm.service: Succeeded.
[    3.316611] systemd[1]: Finished Load Kernel Module drm.
[    3.361494] systemd[1]: Finished Apply Kernel Variables.
[    3.400424] systemd[1]: Finished File System Check on Root Device.
[    3.405320] systemd[1]: Starting Remount Root and Kernel File Systems...
[    3.483222] systemd[1]: Started Journal Service.
[    3.569490] EXT4-fs (mmcblk0p2): re-mounted. Opts: (null). Quota mode: none.
[    3.630191] systemd-journald[135]: Received client request to flush runtime journal.
[    3.647901] systemd-journald[135]: File /var/log/journal/2960b306c0d746c2b388ed0dc7548132/system.journal corrupted or uncleanly shut down, renaming and replacing.
[    4.686751] mc: Linux media interface: v0.10
[    4.782642] vc_sm_cma: module is from the staging directory, the quality is unknown, you have been warned.
[    4.784559] bcm2835_vc_sm_cma_probe: Videocore shared memory driver
[    4.784596] [vc_sm_connected_init]: start
[    4.806349] [vc_sm_connected_init]: installed successfully
[    4.861325] videodev: Linux video capture interface: v2.00
[    4.869542] snd_bcm2835: module is from the staging directory, the quality is unknown, you have been warned.
[    4.927059] bcm2835_audio bcm2835_audio: card created with 8 channels
[    4.945930] bcm2835_mmal_vchiq: module is from the staging directory, the quality is unknown, you have been warned.
[    4.971270] bcm2835_mmal_vchiq: module is from the staging directory, the quality is unknown, you have been warned.
[    4.973078] bcm2835_codec: module is from the staging directory, the quality is unknown, you have been warned.
[    4.992992] bcm2835-codec bcm2835-codec: Device registered as /dev/video10
[    4.993059] bcm2835-codec bcm2835-codec: Loaded V4L2 decode
[    4.996232] bcm2835_isp: module is from the staging directory, the quality is unknown, you have been warned.
[    4.996902] bcm2835-codec bcm2835-codec: Device registered as /dev/video11
[    4.996966] bcm2835-codec bcm2835-codec: Loaded V4L2 encode
[    5.019906] bcm2835-isp bcm2835-isp: Device node output[0] registered as /dev/video13
[    5.023220] bcm2835-isp bcm2835-isp: Device node capture[0] registered as /dev/video14
[    5.024398] bcm2835-codec bcm2835-codec: Device registered as /dev/video12
[    5.024455] bcm2835-codec bcm2835-codec: Loaded V4L2 isp
[    5.025493] bcm2835-isp bcm2835-isp: Device node capture[1] registered as /dev/video15
[    5.028901] bcm2835-isp bcm2835-isp: Device node stats[2] registered as /dev/video16
[    5.028946] bcm2835-isp bcm2835-isp: Register output node 0 with media controller
[    5.028968] bcm2835-isp bcm2835-isp: Register capture node 1 with media controller
[    5.028986] bcm2835-isp bcm2835-isp: Register capture node 2 with media controller
[    5.029023] bcm2835-isp bcm2835-isp: Register capture node 3 with media controller
[    5.033589] rpivid_hevc: module is from the staging directory, the quality is unknown, you have been warned.
[    5.034008] brcmstb-i2c fef04500.i2c:  @97500hz registered in polling mode
[    5.039108] bcm2835-codec bcm2835-codec: Device registered as /dev/video18
[    5.039170] bcm2835-codec bcm2835-codec: Loaded V4L2 image_fx
[    5.040365] bcm2835_v4l2: module is from the staging directory, the quality is unknown, you have been warned.
[    5.043572] bcm2835-isp bcm2835-isp: Device node output[0] registered as /dev/video20
[    5.045759] bcm2835-isp bcm2835-isp: Device node capture[0] registered as /dev/video21
[    5.048962] bcm2835-codec bcm2835-codec: Device registered as /dev/video31
[    5.049031] bcm2835-codec bcm2835-codec: Loaded V4L2 encode_image
[    5.050826] brcmstb-i2c fef09500.i2c:  @97500hz registered in polling mode
[    5.051050] rpivid feb10000.codec: Device registered as /dev/video19
[    5.052057] bcm2835-isp bcm2835-isp: Device node capture[1] registered as /dev/video22
[    5.060090] bcm2835-isp bcm2835-isp: Device node stats[2] registered as /dev/video23
[    5.060136] bcm2835-isp bcm2835-isp: Register output node 0 with media controller
[    5.060157] bcm2835-isp bcm2835-isp: Register capture node 1 with media controller
[    5.060175] bcm2835-isp bcm2835-isp: Register capture node 2 with media controller
[    5.060191] bcm2835-isp bcm2835-isp: Register capture node 3 with media controller
[    5.062300] bcm2835-isp bcm2835-isp: Loaded V4L2 bcm2835-isp
[    5.164429] [drm] Initialized v3d 1.0.0 20180419 for fec00000.v3d on minor 0
[    5.471411] cfg80211: Loading compiled-in X.509 certificates for regulatory database
[    5.518919] cfg80211: Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7'
[    5.536741] cfg80211: loaded regulatory.db is malformed or signature is missing/invalid
[    5.781996] vc4-drm gpu: bound fe400000.hvs (ops vc4_hvs_ops [vc4])
[    5.791625] Registered IR keymap rc-cec
[    5.830851] rc rc0: vc4 as /devices/platform/soc/fef00700.hdmi/rc/rc0
[    5.858276] brcmfmac: F1 signature read @0x18000000=0x15264345
[    5.873428] brcmfmac: brcmf_fw_alloc_request: using brcm/brcmfmac43455-sdio for chip BCM4345/6
[    5.875796] brcmfmac mmc1:0001:1: Direct firmware load for brcm/brcmfmac43455-sdio.raspberrypi,4-model-b.bin failed with error -2
[    5.884539] input: vc4 as /devices/platform/soc/fef00700.hdmi/rc/rc0/input0
[    5.908447] usbcore: registered new interface driver brcmfmac
[    6.029911] vc4-drm gpu: bound fe400000.hvs (ops vc4_hvs_ops [vc4])
[    6.059292] Registered IR keymap rc-cec
[    6.059512] rc rc0: vc4 as /devices/platform/soc/fef00700.hdmi/rc/rc0
[    6.059763] input: vc4 as /devices/platform/soc/fef00700.hdmi/rc/rc0/input1
[    6.134975] brcmfmac: brcmf_fw_alloc_request: using brcm/brcmfmac43455-sdio for chip BCM4345/6
[    6.135152] brcmfmac: brcmf_fw_alloc_request: using brcm/brcmfmac43455-sdio for chip BCM4345/6
[    6.142384] brcmfmac: brcmf_c_preinit_dcmds: Firmware: BCM4345/6 wl0: Nov  1 2021 00:37:25 version 7.45.241 (1a2f2fa CY) FWID 01-703fd60
[    6.379423] vc4-drm gpu: bound fe400000.hvs (ops vc4_hvs_ops [vc4])
[    6.415590] Registered IR keymap rc-cec
[    6.415981] rc rc0: vc4 as /devices/platform/soc/fef00700.hdmi/rc/rc0
[    6.416541] input: vc4 as /devices/platform/soc/fef00700.hdmi/rc/rc0/input2
[    6.460761] vc4-drm gpu: bound fef00700.hdmi (ops vc4_hdmi_ops [vc4])
[    6.466185] Registered IR keymap rc-cec
[    6.472386] rc rc1: vc4 as /devices/platform/soc/fef05700.hdmi/rc/rc1
[    6.545752] input: vc4 as /devices/platform/soc/fef05700.hdmi/rc/rc1/input3
[    6.578465] uart-pl011 fe201000.serial: no DMA platform data
[    6.713866] vc4-drm gpu: bound fef05700.hdmi (ops vc4_hdmi_ops [vc4])
[    6.714413] vc4-drm gpu: bound fe004000.txp (ops vc4_txp_ops [vc4])
[    6.714781] vc4-drm gpu: bound fe206000.pixelvalve (ops vc4_crtc_ops [vc4])
[    6.715081] vc4-drm gpu: bound fe207000.pixelvalve (ops vc4_crtc_ops [vc4])
[    6.715370] vc4-drm gpu: bound fe20a000.pixelvalve (ops vc4_crtc_ops [vc4])
[    6.715626] vc4-drm gpu: bound fe216000.pixelvalve (ops vc4_crtc_ops [vc4])
[    6.715948] vc4-drm gpu: bound fec12000.pixelvalve (ops vc4_crtc_ops [vc4])
[    6.758333] [drm] Initialized vc4 0.0.0 20140616 for gpu on minor 1
[    6.758575] vc4-drm gpu: [drm] Cannot find any crtc or sizes
[    6.958250] Adding 102396k swap on /var/swap.  Priority:-2 extents:1 across:102396k SSFS
[    8.436753] bcmgenet fd580000.ethernet: configuring instance for external RGMII (RX delay)
[    8.437622] bcmgenet fd580000.ethernet eth0: Link is Down
[    8.479229] brcmfmac: brcmf_cfg80211_set_power_mgmt: power save enabled
[    8.996173] brcmfmac: brcmf_cfg80211_set_power_mgmt: power save enabled
[   12.510279] bcmgenet fd580000.ethernet eth0: Link is Up - 1Gbps/Full - flow control off
[   12.510328] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[   12.871833] hdmi-audio-codec hdmi-audio-codec.2.auto: ASoC: error at snd_soc_dai_startup on i2s-hifi: -19
[   12.871888]  MAI: soc_pcm_open() failed (-19)
[   12.872556] hdmi-audio-codec hdmi-audio-codec.2.auto: ASoC: error at snd_soc_dai_startup on i2s-hifi: -19
[   12.872594]  MAI: soc_pcm_open() failed (-19)
[   12.873148] hdmi-audio-codec hdmi-audio-codec.2.auto: ASoC: error at snd_soc_dai_startup on i2s-hifi: -19
[   12.873179]  MAI: soc_pcm_open() failed (-19)
[   12.881097] hdmi-audio-codec hdmi-audio-codec.2.auto: ASoC: error at snd_soc_dai_startup on i2s-hifi: -19
[   12.881152]  MAI: soc_pcm_open() failed (-19)
[   12.881553] hdmi-audio-codec hdmi-audio-codec.2.auto: ASoC: error at snd_soc_dai_startup on i2s-hifi: -19
[   12.881583]  MAI: soc_pcm_open() failed (-19)
[   12.881823] hdmi-audio-codec hdmi-audio-codec.2.auto: ASoC: error at snd_soc_dai_startup on i2s-hifi: -19
[   12.881852]  MAI: soc_pcm_open() failed (-19)
[   13.049891] hdmi-audio-codec hdmi-audio-codec.3.auto: ASoC: error at snd_soc_dai_startup on i2s-hifi: -19
[   13.049945]  MAI: soc_pcm_open() failed (-19)
[   13.050793] hdmi-audio-codec hdmi-audio-codec.3.auto: ASoC: error at snd_soc_dai_startup on i2s-hifi: -19
[   13.050863]  MAI: soc_pcm_open() failed (-19)
[   13.051522] hdmi-audio-codec hdmi-audio-codec.3.auto: ASoC: error at snd_soc_dai_startup on i2s-hifi: -19
[   13.051580]  MAI: soc_pcm_open() failed (-19)
[   13.059469] hdmi-audio-codec hdmi-audio-codec.3.auto: ASoC: error at snd_soc_dai_startup on i2s-hifi: -19
[   13.059543]  MAI: soc_pcm_open() failed (-19)
[   13.059805] hdmi-audio-codec hdmi-audio-codec.3.auto: ASoC: error at snd_soc_dai_startup on i2s-hifi: -19
[   13.059835]  MAI: soc_pcm_open() failed (-19)
[   13.060319] hdmi-audio-codec hdmi-audio-codec.3.auto: ASoC: error at snd_soc_dai_startup on i2s-hifi: -19
[   13.060366]  MAI: soc_pcm_open() failed (-19)
[   14.506147] Bluetooth: Core ver 2.22
[   14.510518] NET: Registered PF_BLUETOOTH protocol family
[   14.510540] Bluetooth: HCI device and connection manager initialized
[   14.510568] Bluetooth: HCI socket layer initialized
[   14.510583] Bluetooth: L2CAP socket layer initialized
[   14.510610] Bluetooth: SCO socket layer initialized
[   14.530448] Bluetooth: HCI UART driver ver 2.3
[   14.530595] Bluetooth: HCI UART protocol H4 registered

[   14.530738] Bluetooth: HCI UART protocol Three-wire (H5) registered
[   14.530979] Bluetooth: HCI UART protocol Broadcom registered
[   14.829412] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[   14.829484] Bluetooth: BNEP filters: protocol multicast
[   14.829530] Bluetooth: BNEP socket layer initialized
[   14.848815] NET: Registered PF_ALG protocol family
[   14.953996] Bluetooth: RFCOMM TTY layer initialized
[   14.954027] Bluetooth: RFCOMM socket layer initialized
[   14.954045] Bluetooth: RFCOMM ver 1.11
[   31.710165] cam-dummy-reg: disabling
[  174.432443] hwmon hwmon1: Undervoltage detected!
[  180.480685] hwmon hwmon1: Voltage normalised
[  189.045307] usb 2-2: new SuperSpeed USB device number 2 using xhci_hcd
[  189.066875] usb 2-2: config 1 has an invalid interface number: 4 but max is 3
[  189.066900] usb 2-2: config 1 has no interface number 2
[  189.067965] usb 2-2: New USB device found, idVendor=1199, idProduct=90d3, bcdDevice= 0.06
[  189.067986] usb 2-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[  189.068002] usb 2-2: Product: Sierra Wireless EM9191
[  189.068015] usb 2-2: Manufacturer: Sierra Wireless, Incorporated
[  189.068028] usb 2-2: SerialNumber: 8W1231014004A121
[  189.078522] usb 2-2: Enable of device-initiated U1 failed.
[  189.080027] usb 2-2: Enable of device-initiated U2 failed.
[  189.179206] usbcore: registered new interface driver cdc_ether
[  189.184750] usbcore: registered new interface driver cdc_ncm
[  189.188408] usbcore: registered new interface driver cdc_wdm
[  189.215331] cdc_mbim 2-2:1.0: setting rx_max = 16384
[  189.215858] cdc_mbim 2-2:1.0: cdc-wdm0: USB WDM device
[  189.216319] cdc_mbim 2-2:1.0 wwan0: register 'cdc_mbim' at usb-0000:01:00.0-2, CDC MBIM, f6:bd:38:9d:df:8c
[  189.217942] usb 2-2: Enable of device-initiated U1 failed.
[  189.222895] usb 2-2: Enable of device-initiated U2 failed.
[  189.223463] usbcore: registered new interface driver cdc_mbim
[  200.641320] hwmon hwmon1: Undervoltage detected!
[  212.737615] hwmon hwmon1: Voltage normalised
[  414.545439] brcmfmac: brcmf_cfg80211_set_power_mgmt: power save enabled
[  472.807381] hwmon hwmon1: Undervoltage detected!
[  478.855397] hwmon hwmon1: Voltage normalised
[  820.567740] brcmfmac: brcmf_cfg80211_set_power_mgmt: power save enabled
[ 1227.550578] brcmfmac: brcmf_cfg80211_set_power_mgmt: power save enabled
[ 1634.565042] brcmfmac: brcmf_cfg80211_set_power_mgmt: power save enabled
[ 2042.571394] brcmfmac: brcmf_cfg80211_set_power_mgmt: power save enabled
[ 2450.582660] brcmfmac: brcmf_cfg80211_set_power_mgmt: power save enabled
[ 2454.570538] hwmon hwmon1: Undervoltage detected!
[ 2462.634942] hwmon hwmon1: Voltage normalised
[ 2858.589081] brcmfmac: brcmf_cfg80211_set_power_mgmt: power save enabled
[ 3265.605499] brcmfmac: brcmf_cfg80211_set_power_mgmt: power save enabled
[ 3283.162648] hwmon hwmon1: Undervoltage detected!
[ 3289.210742] hwmon hwmon1: Voltage normalised

How about typing these?

modprobe usbserial
modprobe qcserial

no output at all, unfortunately