WiFi adapter ALFA awus036axml - trouble initializing USB interface unless bluetooth blacklisted

Harald Linden harald.linden at 7183.org
Wed Jan 31 04:52:13 PST 2024 

Hi list,

I hope I'm in the right place with this - bug report?

I have an ALFA awus036axml, a MediaTek MT7921AUN based adapter with a USB interface.

When I connect it, the initialization of the USB endpoints fails in various 
interesting ways, unless I disable the bluetooth stack entirely, then at least 
the wifi part works.

So, just connecting the thing ends in:

---
[    0.000000] Linux version 6.7.2-arch1-1 (linux at archlinux) (gcc (GCC) 13.2.1 
20230801, GNU ld (GNU Binutils) 2.41.0) #1 SMP PREEMPT_DYNAMIC Fri, 26 Jan 2024 
19:10:20 +0000
[...]
[   47.058294] usb 1-2: new high-speed USB device number 8 using xhci_hcd
[   47.201117] usb 1-2: New USB device found, idVendor=0e8d, idProduct=7961, 
bcdDevice= 1.00
[   47.201131] usb 1-2: New USB device strings: Mfr=6, Product=7, SerialNumber=8
[   47.201138] usb 1-2: Product: Wireless_Device
[   47.201143] usb 1-2: Manufacturer: MediaTek Inc.
[   47.201147] usb 1-2: SerialNumber: 000000000
[   47.312635] Bluetooth: Core ver 2.22
[   47.312655] NET: Registered PF_BLUETOOTH protocol family
[   47.312656] Bluetooth: HCI device and connection manager initialized
[   47.312660] Bluetooth: HCI socket layer initialized
[   47.312661] Bluetooth: L2CAP socket layer initialized
[   47.312665] Bluetooth: SCO socket layer initialized
[   47.382840] usbcore: registered new interface driver btusb
[   47.398008] Bluetooth: hci0: HW/SW Version: 0x008a008a, Build Time: 
20231109191416
[   47.411111] Bluetooth: hci0: urb 00000000ef75083e failed to resubmit (2)
[   71.272318] Bluetooth: hci0: Device setup in 23329385 usecs
[   71.272331] Bluetooth: hci0: HCI Enhanced Setup Synchronous Connection 
command is advertised, but not supported.
[   73.389287] usb 1-2: USB disconnect, device number 8
[   73.411552] Bluetooth: hci0: Opcode 0x0c03 failed: -110
[   75.545068] Bluetooth: hci0: Failed to read MSFT supported features (-110)
[   77.681567] Bluetooth: hci0: AOSP get vendor capabilities (-110)
[   77.682511] mt7921u: probe of 1-2:1.3 failed with error -5
[   77.682608] usbcore: registered new interface driver mt7921u
[   77.958155] usb 1-2: new low-speed USB device number 9 using xhci_hcd
[   78.084817] usb 1-2: device descriptor read/64, error -71
[   78.314885] usb 1-2: device descriptor read/64, error -71
[   78.545365] usb 1-2: new high-speed USB device number 10 using xhci_hcd
[   83.774819] usb 1-2: device descriptor read/64, error -110
[   99.351428] usb 1-2: device descriptor read/64, error -110
[   99.458132] usb usb1-port2: attempt power cycle
[   99.864708] usb 1-2: new high-speed USB device number 11 using xhci_hcd
[  104.985085] xhci_hcd 0000:00:14.0: Timeout while waiting for setup device command
[  110.317916] xhci_hcd 0000:00:14.0: Timeout while waiting for setup device command
[  110.524579] usb 1-2: device not accepting address 11, error -62
[  110.651162] usb 1-2: new high-speed USB device number 12 using xhci_hcd
[  115.864615] xhci_hcd 0000:00:14.0: Timeout while waiting for setup device command
[  121.197918] xhci_hcd 0000:00:14.0: Timeout while waiting for setup device command
[  121.404587] usb 1-2: device not accepting address 12, error -62
[  121.404807] usb usb1-port2: unable to enumerate USB device
---

The port then shows no device connected anymore.

Blacklisting the bluetooth and btusb kernel module results in:
---
[  117.802493] usb 2-2: new SuperSpeed USB device number 5 using xhci_hcd
[  117.821063] usb 2-2: New USB device found, idVendor=0e8d, idProduct=7961, 
bcdDevice= 1.00
[  117.821078] usb 2-2: New USB device strings: Mfr=6, Product=7, SerialNumber=8
[  117.821084] usb 2-2: Product: Wireless_Device
[  117.821088] usb 2-2: Manufacturer: MediaTek Inc.
[  117.821092] usb 2-2: SerialNumber: 000000000
[  117.891920] btmtk: Unknown symbol hci_cmd_sync_queue (err -2)
[  117.891980] btmtk: Unknown symbol hci_devcd_init (err -2)
[  117.892025] btmtk: Unknown symbol hci_devcd_complete (err -2)
[  117.892082] btmtk: Unknown symbol __hci_cmd_send (err -2)
[  117.892122] btmtk: Unknown symbol hci_devcd_register (err -2)
[  117.892213] btmtk: Unknown symbol hci_devcd_append (err -2)
[  117.892261] btmtk: Unknown symbol bt_info (err -2)
[  117.892300] btmtk: Unknown symbol bt_err (err -2)
[  117.892346] btmtk: Unknown symbol __hci_cmd_sync (err -2)
[  118.203433] usb 2-2: reset SuperSpeed USB device number 5 using xhci_hcd
[  118.250711] usbcore: registered new interface driver mt7921u
[  118.258113] mt7921u 2-2:1.3: HW/SW Version: 0x8a108a10, Build Time: 
20231109190918a

[  118.522436] mt7921u 2-2:1.3: WM Firmware Version: ____010000, Build Time: 
20231109190959
[  120.154307] mt7921u 2-2:1.3 wlp0s20f0u2i3: renamed from wlan0
---

So that at least works, at the cost of bluetooth functionality for the entire 
machine. Still, the port reset at 118.2 looks weird and probably shouldn't 
happen that way.

If we look at the lsusb output at this point, we see one device, four endpoints 
and only one of the is the wifi chipset:

---
/:  Bus 002.Port 001: Dev 001, Class=root_hub, Driver=xhci_hcd/6p, 10000M
     ID 1d6b:0003 Linux Foundation 3.0 root hub
     |__ Port 002: Dev 005, If 0, Class=Wireless, Driver=[none], 5000M
         ID 0e8d:7961 MediaTek Inc.
     |__ Port 002: Dev 005, If 1, Class=Wireless, Driver=[none], 5000M
         ID 0e8d:7961 MediaTek Inc.
     |__ Port 002: Dev 005, If 2, Class=Wireless, Driver=[none], 5000M
         ID 0e8d:7961 MediaTek Inc.
     |__ Port 002: Dev 005, If 3, Class=Vendor Specific Class, Driver=mt7921u, 5000M
         ID 0e8d:7961 MediaTek Inc.
---

If this is the wrong place for this report, please point me into a better direction.

Harald
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