Poucas coisas devem ser verificadas:
- O BIOS tem USB ativado - deve ter por padrão
- O kernel Linux tem USB compilado - deve ter, por padrão, se você estiver usando imagem de distro
- o dispositivo USB é válido - deve ser
Se algo ainda estiver faltando, tentarei seguir os seguintes passos:
- comece a seguir
syslog
- conectar dispositivo
- pare de usar
syslog
- verifique
dmesg
Resultado da conexão de algum dispositivo de áudio via USB:
(local) ➜ ~ sudo tail -n 0 -f /var/log/syslog
Feb 14 12:07:58 computer kernel: [ 2362.231113] usb 2-1.2: new full-speed USB device number 8 using ehci-pci
Feb 14 12:07:58 computer kernel: [ 2362.328003] usb 2-1.2: New USB device found, idVendor=08bb, idProduct=2902
Feb 14 12:07:58 computer kernel: [ 2362.328014] usb 2-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
Feb 14 12:07:58 computer kernel: [ 2362.328020] usb 2-1.2: Product: USB Audio CODEC
Feb 14 12:07:58 computer kernel: [ 2362.328025] usb 2-1.2: Manufacturer: Burr-Brown from TI
Feb 14 12:07:58 computer kernel: [ 2362.340682] input: Burr-Brown from TI USB Audio CODEC as /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2/2-1.2:1.3/0003:08BB:2902.0006/input/input26
Feb 14 12:07:58 computer systemd-udevd[7521]: failed to execute '/lib/udev/mtp-probe' 'mtp-probe /sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2 2 8': No such file or directory
Feb 14 12:07:58 computer kernel: [ 2362.395463] hid-generic 0003:08BB:2902.0006: input,hidraw3: USB HID v1.00 Device [Burr-Brown from TI USB Audio CODEC ] on usb-0000:00:1d.0-1.2/input3
Feb 14 12:07:58 computer /usr/lib/gdm3/gdm-x-session[2248]: (II) config/udev: Adding input device Burr-Brown from TI USB Audio CODEC (/dev/input/event23)
Feb 14 12:07:58 computer /usr/lib/gdm3/gdm-x-session[2248]: (**) Burr-Brown from TI USB Audio CODEC : Applying InputClass "evdev keyboard catchall"
Feb 14 12:07:58 computer /usr/lib/gdm3/gdm-x-session[2248]: (II) systemd-logind: got fd for /dev/input/event23 13:87 fd 42 paused 0
Feb 14 12:07:58 computer /usr/lib/gdm3/gdm-x-session[2248]: (II) Using input driver 'evdev' for 'Burr-Brown from TI USB Audio CODEC '
Feb 14 12:07:58 computer /usr/lib/gdm3/gdm-x-session[2248]: (**) Burr-Brown from TI USB Audio CODEC : always reports core events
Feb 14 12:07:58 computer /usr/lib/gdm3/gdm-x-session[2248]: (**) evdev: Burr-Brown from TI USB Audio CODEC : Device: "/dev/input/event23"
Feb 14 12:07:58 computer /usr/lib/gdm3/gdm-x-session[2248]: (--) evdev: Burr-Brown from TI USB Audio CODEC : Vendor 0x8bb Product 0x2902
Feb 14 12:07:58 computer /usr/lib/gdm3/gdm-x-session[2248]: (--) evdev: Burr-Brown from TI USB Audio CODEC : Found keys
Feb 14 12:07:58 computer /usr/lib/gdm3/gdm-x-session[2248]: (II) evdev: Burr-Brown from TI USB Audio CODEC : Configuring as keyboard
Feb 14 12:07:58 computer /usr/lib/gdm3/gdm-x-session[2248]: (**) Option "config_info" "udev:/sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2/2-1.2:1.3/0003:08BB:2902.0006/input/input26/event23"
[..]
(local) ➜ ~ dmesg
[..]
[ 2362.231113] usb 2-1.2: new full-speed USB device number 8 using ehci-pci
[ 2362.328003] usb 2-1.2: New USB device found, idVendor=08bb, idProduct=2902
[ 2362.328014] usb 2-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 2362.328020] usb 2-1.2: Product: USB Audio CODEC
[ 2362.328025] usb 2-1.2: Manufacturer: Burr-Brown from TI
[ 2362.340682] input: Burr-Brown from TI USB Audio CODEC as /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2/2-1.2:1.3/0003:08BB:2902.0006/input/input26
[ 2362.395463] hid-generic 0003:08BB:2902.0006: input,hidraw3: USB HID v1.00 Device [Burr-Brown from TI USB Audio CODEC ] on usb-0000:00:1d.0-1.2/input3
[..]