How to debug if a keyboard doesn't initialize?

[svofski]

Hi!

I'm just trying out TinyUSB examples in pico-sdk. I run examples and I can see a mass storage device, a mouse and a keyboard all work well. However there's one other keyboard that just wouldn't initialize. Here's what I see in the serial console when running tinyusb_host_bare_api example:

Device attached, address = 1
Device 1: ID 1a2c:9cf4
Device Descriptor:
  bLength             18
  bDescriptorType     1
  bcdUSB              0110
  bDeviceClass        0
  bDeviceSubClass     0
  bDeviceProtocol     0
  bMaxPacketSize0     8
  idVendor            0x1a2c
  idProduct           0x9cf4
  bcdDevice           0110
  iManufacturer       1     SEMICO
  iProduct            2     USB Gaming Keyboard
  iSerialNumber       0
  bNumConfigurations  1
Listen to [dev 1: ep 81]
Listen to [dev 1: ep 82]
Device removed, address = 1

But the keyboard doesn't light up and no HID reports are printed. I should note that this keyboard also fails to initialise properly with a CH9350 HID to serial adapter.

When I attach the same keyboard to a linux vm, this is what I get in dmesg:

[14823.797843] usb 2-1: cp210x converter now attached to ttyUSB0
[15135.749276] usb 2-2: new low-speed USB device number 30 using ohci-pci
[15136.264810] usb 2-2: New USB device found, idVendor=1a2c, idProduct=9cf4, bcdDevice= 1.10
[15136.264815] usb 2-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[15136.264817] usb 2-2: Product: USB Gaming Keyboard
[15136.264818] usb 2-2: Manufacturer: SEMICO
[15136.284698] input: SEMICO   USB Gaming Keyboard  as /devices/pci0000:00/0000:00:06.0/usb2/2-2/2-2:1.0/0003:1A2C:9CF4.0009/input/input30
[15136.342892] hid-generic 0003:1A2C:9CF4.0009: input,hidraw0: USB HID v1.10 Keyboard [SEMICO   USB Gaming Keyboard ] on usb-0000:00:06.0-2/input0
[15136.374106] input: SEMICO   USB Gaming Keyboard  Consumer Control as /devices/pci0000:00/0000:00:06.0/usb2/2-2/2-2:1.1/0003:1A2C:9CF4.000A/input/input31
[15136.435599] input: SEMICO   USB Gaming Keyboard  System Control as /devices/pci0000:00/0000:00:06.0/usb2/2-2/2-2:1.1/0003:1A2C:9CF4.000A/input/input32
[15136.435724] input: SEMICO   USB Gaming Keyboard  Keyboard as /devices/pci0000:00/0000:00:06.0/usb2/2-2/2-2:1.1/0003:1A2C:9CF4.000A/input/input34
[15136.436152] hid-generic 0003:1A2C:9CF4.000A: input,hiddev96,hidraw1: USB HID v1.10 Keyboard [SEMICO   USB Gaming Keyboard ] on usb-0000:00:06.0-2/input1

I don't really know where to begin. Any help is appreciated, thanks!