Bug 211905 - HP lt4120 Snapdragon X5 LTE modem broken since Linux 5.9 Kernel
Summary: HP lt4120 Snapdragon X5 LTE modem broken since Linux 5.9 Kernel
Status: NEW
Alias: None
Product: Networking
Classification: Unclassified
Component: Wireless (show other bugs)
Hardware: x86-64 Linux
: P1 normal
Assignee: networking_wireless@kernel-bugs.osdl.org
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2021-02-23 16:31 UTC by C Schumaker
Modified: 2022-08-04 08:49 UTC (History)
4 users (show)

See Also:
Kernel Version: 5.10.16
Subsystem:
Regression: No
Bisected commit-id:


Attachments

Description C Schumaker 2021-02-23 16:31:08 UTC
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)
Comment 1 Brian Carringwell 2021-12-17 02:02:20 UTC
I believe I too am experiencing the same issue on a HP Elitebook 850 G3.
Comment 2 Peter 2022-05-28 13:57:39 UTC
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.
Comment 3 robnunin 2022-08-04 08:49:05 UTC
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=

Note You need to log in before you can comment on or make changes to this bug.