Problem after Update: USB Tethering Interface Not Connecting

[mokshabound]

After a recent system update, USB tethering from my phone (POCO F6) stopped working automatically. Before the update, it used to connect my Android phone without issues and tether internet via USB.

I can still connect to my phone via WiFi hotspot and access the internet.

From journalctl -f

Mai 11 12:54:39 xpg mtp-probe[4198]: bus: 1, device: 14 was not an MTP device
Mai 11 12:54:39 xpg kernel: rndis_host 1-10.3:1.0 wwp0s20f0u10u3: renamed from wwan0
Mai 11 12:54:39 xpg mtp-probe[4201]: checking bus 1, device 14: "/sys/devices/pci0000:00/0000:00:14.0/usb1/1-10/1-10.3"
Mai 11 12:54:39 xpg mtp-probe[4201]: bus: 1, device: 14 was not an MTP device
Mai 11 12:54:39 xpg ModemManager[850]: <wrn> [plugin-manager] task 4: port context already scheduled
Mai 11 12:54:43 xpg ModemManager[850]: <msg> [base-manager] couldn't check support for device '/sys/devices/pci0000:00/0000:00:14.0/usb1/1-10/1-10.3': not supported by any plugin

ip -a

7: wwp0s20f0u10u3: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ether 5a:66:97:f9:ee:2c brd ff:ff:ff:ff:ff:ff
    altname wwx5a6697f9ee2c

nmcli device status

DEVICE             TYPE      STATE                   CONNECTION 
wlp0s20f3          wifi      connected               SSID 
lo                 loopback  connected (externally)  lo         
docker0            bridge    connected (externally)  docker0    
p2p-dev-wlp0s20f3  wifi-p2p  disconnected            --         
enp5s0             ethernet  unavailable             -- 

I tried to follow the troubleshooting steps the GPTs gave me. I am not sure where to go from here. There was a kernel update, I did this morning, after that, USB tethering does not seem to work.

[Nachlese]

@mokshabound

I tried to follow the troubleshooting steps the GPTs gave me.

GPT doesn’t “know” squat.
I recommend not getting into a habit of relying on it.
It may be ok as a secondary source - you can extract good information by conversing with it when you already have your own facts and knowledge.
Try a good old fashioned google search and some reading.

Even here in the forum this problem was brought up.

From what I recall:
some change in recent kernels - which by now has been reverted

Perhaps this change has not yet made it’s way into the affected kernels for Manjaro stable - but older kernels never had this issue.

[scotty65]

Welcome to the Manjaro community @mokshabound

GPT is rarely a good choice for advice when it comes to a rolling release distro such as Manjaro, as the AI training data will probably be at least a year out-of-date.

You would likely have found a viable solution much quicker if you had clicked the search button at the top of the forum: Search results for ‘tether’ - Manjaro Linux Forum

As @Nachlese mentioned, it is most likely an issue to do with the linux614 kernel:

Update 05/05/2025: USB tethering not working

It will be fixed in kernel 6.14.6.

That same thread has a solution which can be used until kernel 6.14.6 reaches Stable branch:

Update 05/05/2025: USB tethering not working

Yes, I noticed that too. Following the advice of my colleague napcok, I downgraded the kernel to 5.15 LTS: USB tethering works fine. I can say that the problem has been solved. However, I think that going back to an older kernel is not a good solution. There is a question: until when is support for 5.15 LTS?

Alternatively, you could switch to either Testing or Unstable branch, both of which have kernel 6.14.6-1 in the repos:

Output of: mbn info linux614 -q | grep -Ev 'Name|Repository|Packager'

mbn info linux614 -q | grep -Ev 'Name|Repository|Packager'
Branch         : unstable
Version        : 6.14.6-1
Build Date     : Fri 09 May 2025 20:53:24 
Branch         : testing
Version        : 6.14.6-1
Build Date     : Fri 09 May 2025 20:53:24 
Branch         : stable
Version        : 6.14.4-1
Build Date     : Sat 26 Apr 2025 15:52:09 

_{mbn can be found in the manjaro-check-repos package}

To switch to Testing branch:

sudo pacman-mirrors --api --set-branch testing

or, to switch to Unstable branch:

sudo pacman-mirrors --api --set-branch unstable

After you changed the branch, rebuild the mirrorlist and update your packages:

sudo pacman-mirrors --continent && sudo pacman -Syu

Switching Branches

[mokshabound]

Using linux515 kernel now, usb tethering is working as expected.

I tried using linux66, linux61 usb tethering did not work for both of them.

Thank you for your time guys.

[Teo]

The patch for this regression will most probably reach the other kernels too in a couple of weeks.