(solved) COMFAST CX-951AX not work properly

[Lingzilla]

Hi, I bought a COMFAST CX-951AX on Alipress and hopfully wanna just plug and play

I got this with lsusb command:

Bus 002 Device 008: ID 0e8d:7961 MediaTek Inc. Wireless_Device

and I got these errors in the dmesg output:

[  820.059522] usb 2-1: new SuperSpeed USB device number 14 using xhci_hcd
[  820.075140] usb 2-1: New USB device found, idVendor=0e8d, idProduct=7961, bcdDevice= 1.00
[  820.075153] usb 2-1: New USB device strings: Mfr=6, Product=7, SerialNumber=8
[  820.075156] usb 2-1: Product: Wireless_Device
[  820.075158] usb 2-1: Manufacturer: MediaTek Inc.
[  820.075160] usb 2-1: SerialNumber: 000000000
[  820.127657] Bluetooth: hci1: HW/SW Version: 0x008a008a, Build Time: 20231109191416
[  822.803088] Bluetooth: hci1: Device setup in 2656161 usecs
[  822.803103] Bluetooth: hci1: HCI Enhanced Setup Synchronous Connection command is advertised, but not supported.
[  824.852402] Bluetooth: hci1: Opcode 0x0c03 failed: -110
[  826.901342] Bluetooth: hci1: Failed to read MSFT supported features (-110)
[  828.948313] Bluetooth: hci1: AOSP get vendor capabilities (-110)
[  834.198267] xhci_hcd 0000:00:15.0: Timeout while waiting for setup device command
[  839.828196] xhci_hcd 0000:00:15.0: Timeout while waiting for setup device command
[  840.036150] usb 2-1: device not accepting address 14, error -62
[  845.461108] xhci_hcd 0000:00:15.0: Timeout while waiting for setup device command
[  851.092022] xhci_hcd 0000:00:15.0: Timeout while waiting for setup device command
[  851.299999] usb 2-1: device not accepting address 14, error -62
[  856.724081] xhci_hcd 0000:00:15.0: Timeout while waiting for setup device command
[  862.356874] xhci_hcd 0000:00:15.0: Timeout while waiting for setup device command
[  862.563854] usb 2-1: device not accepting address 14, error -62
[  867.987809] xhci_hcd 0000:00:15.0: Timeout while waiting for setup device command
[  873.619733] xhci_hcd 0000:00:15.0: Timeout while waiting for setup device command
[  873.827698] usb 2-1: device not accepting address 14, error -62
[  873.846765] mt7921u: probe of 2-1:1.3 failed with error -5
[  873.847029] usb 2-1: USB disconnect, device number 14
[  878.256397] perf: interrupt took too long (2502 > 2500), lowering kernel.perf_event_max_sample_rate to 79000
[  879.251651] xhci_hcd 0000:00:15.0: Timeout while waiting for setup device command
[  884.883858] xhci_hcd 0000:00:15.0: Timeout while waiting for setup device command
[  885.091553] usb 2-1: device not accepting address 15, error -62
[  890.515584] xhci_hcd 0000:00:15.0: Timeout while waiting for setup device command
[  896.147469] xhci_hcd 0000:00:15.0: Timeout while waiting for setup device command
[  896.355347] usb 2-1: device not accepting address 16, error -62
[  896.363436] usb usb2-port1: attempt power cycle
[  902.300138] xhci_hcd 0000:00:15.0: Timeout while waiting for setup device command
[  907.923297] xhci_hcd 0000:00:15.0: Timeout while waiting for setup device command
[  908.131121] usb 2-1: device not accepting address 17, error -62
[  913.556007] xhci_hcd 0000:00:15.0: Timeout while waiting for setup device command
[  919.186932] xhci_hcd 0000:00:15.0: Timeout while waiting for setup device command
[  919.394905] usb 2-1: device not accepting address 18, error -62
[  919.403022] usb usb2-port1: unable to enumerate USB device

[bjlockie]

What kernel and distro and hardware? Delete the Bluetooth firmware and/or try a different USB port.

[Lingzilla]

I uses Fedora39 on a laptop with N4020 CPU, and plugged this dongle into the one of USB ports on this machine.

I have already tried a different port, but still got the same issue.

And I tried to use it on my newer machine with ArchLinux installed and Intel 1240P processor, still this problem.

I have also tried this on Windows 11 with COMFAST offical Windows driver installed, but got error

" This device is not functioning well with error number -10, this device can not be started. "

[morrownr]

@Lingzilla

I also have a cx-951ax. When I first got it, I went through about what you are going through. Over a period of a few days it started working. I think the problem was due to a manufacturing issue. My best guess is that there was something left on one or more of the usb pins in the adapter and it was not making good contact. I think putting it in and out many times helped it make better contact and it started working. I still can't use it with extention cables or powered hubs but can use it with an L shaped adapter.

It actually does a decent job for what I use it for these days but Comfast's quality control is not impressive... at least with this adapter. I have read a lot of good comments from others that seem to indicate they have had better success with the 953ax and 952ax as far as Comfast adapters go. I also have an Alfa AXML which is far better quality but then the price is much higher.

If the adapter does not work well within a few days, you should probably return it and look at something else. There are other low cost adapters with the same chipset in the Plug and Play List.

Cheers,

@morrownr

[Lingzilla]

What kernel and distro and hardware? Delete the Bluetooth firmware and/or try a different USB port.

how to archive this (I use archlinux)?

only remove the firmware used by this chip?

I finally got it work by using modprobe -r btusb to disable bluetooth usb module in kernel to get the wifi functioning.

[morrownr]

only remove the firmware used by this chip?

Disregard. Let's try something else.

New firmware files were posted yesterday. This is something that you can update. Maybe it will help. Go to:

https://github.com/morrownr/USB-WiFi/blob/main/home/How_to_Install_Firmware_for_Mediatek_based_USB_WiFi_adapters.md

Follow the instructions in Section 3.

Let me know.

@morrownr

[Lingzilla]

THX. Everything is working fine now :)

[morrownr]

Glad to hear it. Enjoy.