Broken USB tethering on SFT1200

pwrli · 2022-04-27T06:19:22.851Z

Hi there.

I connect my S21 and try to enable USB tethering on SFT1200.
When I plug on USB cable and my phone show cable is disconnected.

I got kernel message from router and attached here.

[  174.720212] usb 1-1: new high-speed USB device number 2 using dwc2
[  174.979844] cdc_acm 1-1:1.1: ttyACM0: USB ACM device
[  175.050365] dwc2 17000000.usb: Overcurrent change detected
[  175.290399] usb 1-1: USB disconnect, device number 2

alzhao · 2022-04-27T10:44:57.750Z

pwrli:

[  175.050365] dwc2 17000000.usb: Overcurrent change detected

Seems the phone draws too much power.

wcs2228 · 2022-04-27T16:03:22.418Z

Try turning off “Fast charging” and “Super fast charging” on your Samsung S21.

EDIT:
Make sure that your USB-C to USB-A cable has a 56K ohm pull-up resistor.

I do not work for and I do not have formal association with GL.iNet

pwrli · 2022-04-28T03:00:33.325Z

Thanks for reply!

The problem is solved after I used another AC adapter.

Can I solder USB port VBUS to USBC’s VBUS to bypass the overcurrent detection?

alzhao · 2022-04-28T05:07:18.645Z

As long as it is working, pls don’t do any modification further.