Hi ! If i use kernel 5.4.95-1-lts the internal lte modem work without a problem -> it work with networkmanager But if i use kernel begin with 5.9 kernel it doesnt work : I have test kernel -> always last one begin with 5.7 Here the results 5.7.12 work 5.8.14 work 5.9.14 not work 5.10.16 not work lsusb Bus 001 Device 002: ID 03f0:9d1d HP, Inc HP lt4120 Snapdragon X5 LTE 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= 5 Cfg#= 1 Atr=e0 MxPwr=500mA I: If#=0x0 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=(none) I: If#=0x1 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=ff Prot=ff Driver=qmi_wwan I: If#=0x2 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=(none) I: If#=0x3 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=(none) I: If#=0x4 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=(none)
I believe I too am experiencing the same issue on a HP Elitebook 850 G3.
Had same problem. LT4120 did not work anymore since update to Kernel 5.9.x I today solved the problem in a quite strange way. I booted my Manjaro once with Kernel 5.4 where the LTE card worked. After rebooting again with Kernel 5.15.41 is kept working.
Had same problem, on kernel 5.14.0-70.17.1 HP Elitebook 820 G3. 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': No such file or directory cat: '/sys/bus/usb/devices/usb1/1-3/1-*:?.*/bAlternateSetting': No such file or directory cat: '/sys/bus/usb/devices/usb1/1-3/1-*:?.*/bNumEndpoints': No such file or directory cat: '/sys/bus/usb/devices/usb1/1-3/1-*:?.*/bInterfaceClass': No such file or directory cat: '/sys/bus/usb/devices/usb1/1-3/1-*:?.*/bInterfaceSubClass': No such file or directory cat: '/sys/bus/usb/devices/usb1/1-3/1-*:?.*/bInterfaceProtocol': No such file or directory /usr/bin/usb-devices: line 79: printf: (none): invalid number I: If#=0x Alt= 0 #EPs= 0 Cls=() Sub= Prot= Driver=