The WWAN - Huawei Technologies Co., Ltd. [12d1:15c1] does not work after install Ubuntu Hirsute.

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Can we get the results fro the following commands:

$ lspci
$ sudo mmcli --list-modems
$ sudo mmcli --modem 0

u@u-ThinkPad-L460:~$ lspci -nn
00:00.0 Host bridge [0600]: Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor Host Bridge/DRAM Registers [8086:1904] (rev 08)
00:02.0 VGA compatible controller [0300]: Intel Corporation Skylake GT2 [HD Graphics 520] [8086:1916] (rev 07)
00:14.0 USB controller [0c03]: Intel Corporation Sunrise Point-LP USB 3.0 xHCI Controller [8086:9d2f] (rev 21)
00:14.2 Signal processing controller [1180]: Intel Corporation Sunrise Point-LP Thermal subsystem [8086:9d31] (rev 21)
00:16.0 Communication controller [0780]: Intel Corporation Sunrise Point-LP CSME HECI #1 [8086:9d3a] (rev 21)
00:17.0 SATA controller [0106]: Intel Corporation Sunrise Point-LP SATA Controller [AHCI mode] [8086:9d03] (rev 21)
00:1c.0 PCI bridge [0604]: Intel Corporation Sunrise Point-LP PCI Express Root Port #1 [8086:9d10] (rev f1)
00:1c.2 PCI bridge [0604]: Intel Corporation Sunrise Point-LP PCI Express Root Port #3 [8086:9d12] (rev f1)
00:1d.0 PCI bridge [0604]: Intel Corporation Sunrise Point-LP PCI Express Root Port #9 [8086:9d18] (rev f1)
00:1f.0 ISA bridge [0601]: Intel Corporation Sunrise Point-LP LPC Controller [8086:9d48] (rev 21)
00:1f.2 Memory controller [0580]: Intel Corporation Sunrise Point-LP PMC [8086:9d21] (rev 21)
00:1f.3 Audio device [0403]: Intel Corporation Sunrise Point-LP HD Audio [8086:9d70] (rev 21)
00:1f.4 SMBus [0c05]: Intel Corporation Sunrise Point-LP SMBus [8086:9d23] (rev 21)
00:1f.6 Ethernet controller [0200]: Intel Corporation Ethernet Connection I219-V [8086:1570] (rev 21)
02:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS522A PCI Express Card Reader [10ec:522a] (rev 01)
03:00.0 Network controller [0280]: Intel Corporation Wireless 8260 [8086:24f3] (rev 3a)
04:00.0 Display controller [0380]: Advanced Micro Devices, Inc. [AMD/ATI] Sun XT [Radeon HD 8670A/8670M/8690M / R5 M330 / M430 / Radeon 520 Mobile] [1002:6660] (rev 83)

u@u-ThinkPad-L460:~$ sudo mmcli --list-modems
[sudo] password for u:
No modems were found

u@u-ThinkPad-L460:~$ sudo mmcli --modem 0
error: couldn't find modem

u@u-ThinkPad-L460:~$ lsusb
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 005: ID 12d1:15c1 Huawei Technologies Co., Ltd. ME906s LTE M.2 Module
Bus 001 Device 004: ID 5986:0708 Acer, Inc Integrated Camera
Bus 001 Device 006: ID 8087:0a2b Intel Corp. Bluetooth wireless interface
Bus 001 Device 002: ID 138a:0011 Validity Sensors, Inc. VFS5011 Fingerprint Reader
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

@Gabriel

Because this modem passed the test using Focal,
can you help to test the following cases for comparison?

(1) Using Hirsute
    The ModemManager is replaced from the -proposed channel
    The default kernel in Hirsute is replaced with Focal’s kernel
(2) Using Focal
    The ModemManager is replaced from the -proposed channel
    The default kernel in Focal is replaced with Hirsute’s kernel

If (1) passed, no need to test (2)

@Jerry-lee-tpe,

Following your steps:

Hirsute is installed on L460 , the kernel is replaced with Focal's kernel (5.8.0-63-generic)

(1) is passed.

The initial kernel of Hirsute is 5.11.0-16-generic, the issue reproduces;

Upgrade kernel to 5.11.0-31-generic, the issue reproduces.

@Gabriel

Can you also check linux-image-generic-hwe-20.04 on focal ? it's 5.11 as well.

linux-image-generic-hwe-20.04
5.11.0.27.29~20.04.11

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1940377

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

After debug, this issue is not related to kernel. cdc_ether was unregistered by usb-modeswitch.
After I installed the old verison of usb-modeswitch, this issue is fixed, it looks like a regression.

Aug 30 05:54:32 u-ThinkPad-L460 kernel: cdc_ether 1-9:2.0 wwan0: register 'cdc_ether' at usb-0000:00:14.0-9, Mobile Broadband Network Device, 02:1e:10:1f:00:00
Aug 30 05:54:32 u-ThinkPad-L460 kernel: usbcore: registered new interface driver cdc_ether
Aug 30 05:54:32 u-ThinkPad-L460 kernel: cdc_ether 1-9:2.0 wwx021e101f0000: renamed from wwan0
Aug 30 05:54:33 u-ThinkPad-L460 kernel: cdc_ether 1-9:2.0 wwx021e101f0000: unregister 'cdc_ether' usb-0000:00:14.0-9, Mobile Broadband Network Device

Thanks BinLi,

Also confirmed cdc_mbim with Quectel modem OK.

Status changed to 'Confirmed' because the bug affects multiple users.

There are 2 usable configurations in 12d1:15c1, cfg#2 which is cdc_ether and cfg#3 which is cdc_mbim , usb_modeswitch will select the linux preferred mbim configuration if mbim drivers are present in the kernel. This is by design and not a bug.

A user who prefers cdc_ether can disable the the automagic mbim switch by changing the line DisableMBIMGlobal=0 to DisableMBIMGlobal=1 in /etc/usb_modeswitch.conf, there is really no need to revert to an older usb_modeswitch version in order to disable the mbim auto selection.