router@amz-z25-5G:~$ lsusb -t
/: Bus 04.Port 1: Dev 1, Class=root_hub, Driver=xhci-mtk/1p, 5000M
/: Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci-mtk/2p, 480M
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 5000M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 480M
|__ Port 1: Dev 3, If 0, Class=Vendor Specific Class, Driver=option, 480M
|__ Port 1: Dev 3, If 1, Class=Vendor Specific Class, Driver=option, 480M
|__ Port 1: Dev 3, If 2, Class=Vendor Specific Class, Driver=option, 480M
|__ Port 1: Dev 3, If 3, Class=Vendor Specific Class, Driver=option, 480M
|__ Port 1: Dev 3, If 4, Class=Vendor Specific Class, Driver=qmi_wwan, 480M
|__ Port 2: Dev 2, If 4, Class=Vendor Specific Class, Driver=qmi_wwan, 480M
|__ Port 2: Dev 2, If 2, Class=Vendor Specific Class, Driver=option, 480M
|__ Port 2: Dev 2, If 0, Class=Vendor Specific Class, Driver=option, 480M
|__ Port 2: Dev 2, If 3, Class=Vendor Specific Class, Driver=option, 480M
|__ Port 2: Dev 2, If 1, Class=Vendor Specific Class, Driver=option, 480M
router@amz-z25-5G:~$ lsusb
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 002: ID 2c7c:0125 Quectel Wireless Solutions Co., Ltd. EC25 LTE modem
Bus 001 Device 003: ID 2c7c:0125 Quectel Wireless Solutions Co., Ltd. EC25 LTE modem
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
router@amz-z25-5G:~$ mmcli -L
/org/freedesktop/ModemManager1/Modem/1 [QUALCOMM INCORPORATED] QUECTEL Mobile Broadband Module
/org/freedesktop/ModemManager1/Modem/0 [QUALCOMM INCORPORATED] QUECTEL Mobile Broadband Module
router@amz-z25-5G:~$
This issue showing across reboot.
If we reboot again all Modems will show up.
Issue is showing only when we have the 5G Modem installed in the system.
On one unit, we removed and running reboot test, there it is holding good for 200+ iterations of reboot.
Whether it needs new USB driver compatible to Quectel 5G Modems or it needs any new driver w.r.t 5G Modems.