[arch-general] Cannot tether from Android using USB or bluetooth

[Alfredo Palhares]

Hello fellow Arch Linux users,

I recently tried to use USB tethering, without success. The interface just won't
come up.

I enabled the usb tethering on the phone, but ip link didn't show any new
interface:

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: enp0s25: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc fq_codel state DOWN mode DEFAULT group default qlen 1000
    link/ether 28:d2:44:6c:0b:f8 brd ff:ff:ff:ff:ff:ff
3: wlp3s0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
    link/ether 7c:7a:91:21:19:39 brd ff:ff:ff:ff:ff:ff
5: wwp0s20u4i6: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
    link/ether 02:15:e0:ec:01:00 brd ff:ff:ff:ff:ff:ff

(wwp0s20u4i6 is my builtin modem interface)

journalctl -k tells me the following:

myhost kernel: usb 1-1: device descriptor read/64, error -110
myhost kernel: usb 1-1: new low-speed USB device number 37 using xhci_hcd
myhost kernel: usb 1-1: device descriptor read/64, error -71
myhost kernel: usb 1-1: device descriptor read/64, error -110
myhost kernel: usb 1-1: new low-speed USB device number 38 using xhci_hcd
myhost kernel: usb 1-1: Device not responding to setup address.
myhost kernel: usb 1-1: Device not responding to setup address.
myhost kernel: usb 1-1: device not accepting address 38, error -71
myhost kernel: usb 1-1: new low-speed USB device number 39 using xhci_hcd
myhost kernel: usb 1-1: Device not responding to setup address.
myhost kernel: usb 1-1: Device not responding to setup address.
myhost kernel: usb 1-1: device not accepting address 39, error -71
myhost kernel: usb usb1-port1: unable to enumerate USB device
myhost kernel: usb 1-1: new high-speed USB device number 40 using xhci_hcd
myhost kernel: cdc_acm 1-1:1.1: ttyACM3: USB ACM device
myhost kernel: usb 1-1: USB disconnect, device number 40
myhost kernel: cdc_acm 1-1:1.1: failed to set dtr/rts
myhost kernel: usb 1-1: new high-speed USB device number 41 using xhci_hcd
myhost kernel: rndis_host 1-1:1.0 usb0: register 'rndis_host' at usb-0000:00:14.0-1, RNDIS device, aa:bb:cc:dd:ee:ff
myhost kernel: rndis_host 1-1:1.0 enp0s20u1: renamed from usb0
myhost kernel: usb 1-1: USB disconnect, device number 41
myhost kernel: rndis_host 1-1:1.0 enp0s20u1: unregister 'rndis_host' usb-0000:00:14.0-1, RNDIS device
myhost kernel: usb 1-1: new low-speed USB device number 43 using xhci_hcd

The important stuff seems to be here:
rndis_host 1-1:1.0 enp0s20u1: renamed from usb0
usb 1-1: USB disconnect, device number 41
rndis_host 1-1:1.0 enp0s20u1: unregister 'rndis_host' usb-0000:00:14.0-1, RNDIS device
usb 1-1: new low-speed USB device number 43 using xhci_hcd

The interface comes up but its immediately down, for some weird reason. I can't
reproduce the problem every time.

Anyone can point me on how to debug this further?

Regards,

-- 
Alfredo Palhares
GPG/PGP Key Fingerprint
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