HP lt4120 ROcky 9.0 not working

Infrastructure
1

I have an (old) laptop, HP Elitebook G3, with HP, Inc HP lt4120 Snapdragon X5 LTE mobile modem.
It has USD device identifier 03f0:9d1d, that I can find in dmesg but, unfortunately, cannot use it to connect to Internet.

nmcli reports: Error: Connection activation failed: No suitable device found for this connection (device lo not available because device is strictly unmanaged).

In the installation phase I was able to configure GSM provider connections without problems.
Device is working fine (tested with a live image and with another operating system.)

Has worked as expected with Rocky 8.6

Any hints about ?

From dmesg:

[ 4.273652] usb 1-3: New USB device found, idVendor=03f0, idProduct=9d1d, bcdDevice= 2.28
[ 4.273655] usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 4.273657] usb 1-3: Product: HP lt4120 Snapdragon X5 LTE
[ 4.273658] usb 1-3: Manufacturer: HP
[ 4.273659] usb 1-3: SerialNumber: 0123456789ABCDEF

usb_modeswitch output:

usb_modeswitch -v 03f0 -p 9d1d

Look for default devices …
Found devices in default mode (1)
Access device 002 on bus 001
Get the current device configuration …
Determining the active configuration failed (error -5). Abort

Any hints ?
Thanks

2

Hmm. It should be supported by the Rocky Linux 9 kernel configuration: SOURCES/kernel-x86_64-rhel.config · r9 · staging / rpms / kernel · GitLab

Does anything show up in dmesg when you do the usb_modeswitch?

3

Look nothing is reported in dmesg

usb_modeswitch with -W report, in addition:

ibusb: error [op_get_active_config_descriptor] device unconfigured
Determining the active configuration failed (error -5). Abort

Certainly, the device have 3 distinct modes:

bNumConfigurations 3

4

No further suggestion on this topic ?
Here’s output from usb-devices:

T:  Bus=01 Lev=01 Prnt=01 Port=02 Cnt=01 Dev#=  2 Spd=480 MxCh= 0
D:  Ver= 2.00 Cls=ef(misc ) Sub=02 Prot=01 MxPS=64 #Cfgs=  3
P:  Vendor=03f0 ProdID=9d1d Rev=02.28
S:  Manufacturer=HP
S:  Product=HP lt4120 Snapdragon X5 LTE
S:  SerialNumber=0123456789ABCDEF
C:  #Ifs= 0 Cfg#= 0 Atr= MxPwr=
cat: '/sys/bus/usb/devices/usb1/1-3/1-*:?.*/bInterfaceNumber': File or directory non existent
cat: '/sys/bus/usb/devices/usb1/1-3/1-*:?.*/bAlternateSetting': File or directory non existent
cat: '/sys/bus/usb/devices/usb1/1-3/1-*:?.*/bNumEndpoints': File or directory non existent
cat: '/sys/bus/usb/devices/usb1/1-3/1-*:?.*/bInterfaceClass': File or directory non existent
cat: '/sys/bus/usb/devices/usb1/1-3/1-*:?.*/bInterfaceSubClass': File or directory non existent
cat: '/sys/bus/usb/devices/usb1/1-3/1-*:?.*/bInterfaceProtocol': File or directory non existent
/usr/bin/usb-devices: riga 79: printf: (none): number not valid
I:  If#=0x Alt= 0 #EPs= 0 Cls=() Sub= Prot= Driver=

Device is certainly working. Booting from Win10 partition, device is identified and works flawlessly.

I have also a second device, identical, same results.
Nothng has changed moving to 9.1

Some words were tranlsated from Italian to English…

5

After digging around and mixing some information from other posts, related to old Fedora / CentOS relelases, i’ve tried to ad an udev rule, with the following sentences:

ACTION==“add|change”, ATTR{idVendor}==“03f0”, ATTR{idProduct}==“9d1d”, ATTR{bConfigurationValue}==“2”, ATTR{bConfigurationValue}:=“3”

rebooted laptop, now it’s working.