My EG25-G was working just fine and it was creating the /dev/ttyUSB{0-3} ports as described in the user manual. I was using /dev/ttyUSB3 for AT commands and all worked fine.
I issued the command AT+QCFG="usbauto",1 and saved (AT&W), I was testing for some debug port functionality
After this point on (disconnecting the modem and connecting again to USB), the modem is still detected (dmesg shows detection) but it is recognized as RNDIS device. No /dev/ttyUSB* ports are creaeted and I can’t send any AT commands to it. (I can see a new usb0 network device now.
Here’s lsusb output
$ lsusb Sun 26 Feb 2023 12:41:37 AM CET
Bus 003 Device 005: ID 2c7c:0125 Quectel Wireless Solutions Co., Ltd. EC25 LTE modem
Here is dmesg messages (related stuff)
$ dmesg
...
[ 551.736515] usb 3-1.3: new high-speed USB device number 5 using ehci-pci
[ 551.858826] usb 3-1.3: New USB device found, idVendor=2c7c, idProduct=0125, bcdDevice= 3.18
[ 551.858837] usb 3-1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 551.858841] usb 3-1.3: Product: EG25-G
[ 551.858845] usb 3-1.3: Manufacturer: Quectel
[ 551.874081] rndis_host 3-1.3:1.0 usb0: register 'rndis_host' at usb-0000:00:1d.7-1.3, RNDIS device, 4a:59:eb:24:8f:ca
...
and here’s ip addr output:
$ ip addr
...
6: usb0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN group default qlen 1000
link/ether 4a:59:eb:24:8f:ca brd ff:ff:ff:ff:ff:ff
inet 192.168.225.30/24 brd 192.168.225.255 scope global dynamic noprefixroute usb0
valid_lft 43004sec preferred_lft 43004sec
inet6 fe80::4859:ebff:fe24:8fca/64 scope link noprefixroute
valid_lft forever preferred_lft forever
...
And finally here’s the /sys/kernel/debug/usb/devices output (relevant part):
P: Vendor=2c7c ProdID=0125 Rev= 3.18
S: Manufacturer=Quectel
S: Product=EG25-G
C:* #Ifs= 2 Cfg#= 1 Atr=a0 MxPwr=500mA
A: FirstIf#= 0 IfCount= 2 Cls=e0(wlcon) Sub=01 Prot=03
I:* If#= 0 Alt= 0 #EPs= 1 Cls=e0(wlcon) Sub=01 Prot=03 Driver=rndis_host
E: Ad=82(I) Atr=03(Int.) MxPS= 8 Ivl=32ms
I:* If#= 1 Alt= 0 #EPs= 2 Cls=0a(data ) Sub=00 Prot=00 Driver=rndis_host
E: Ad=81(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E: Ad=01(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
C: #Ifs= 2 Cfg#= 2 Atr=a0 MxPwr=500mA
A: FirstIf#= 0 IfCount= 2 Cls=02(comm.) Sub=06 Prot=00
I: If#= 0 Alt= 0 #EPs= 1 Cls=02(comm.) Sub=06 Prot=00 Driver=
E: Ad=82(I) Atr=03(Int.) MxPS= 16 Ivl=32ms
I: If#= 1 Alt= 0 #EPs= 0 Cls=0a(data ) Sub=00 Prot=00 Driver=
I: If#= 1 Alt= 1 #EPs= 2 Cls=0a(data ) Sub=00 Prot=00 Driver=
E: Ad=81(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E: Ad=01(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
Is there a way to bring back the ttyUSB* ports? Or is there a way to send any AT commands to the modem now?