Eu tenho executado o Ubuntu 14.04 no meu Acer Aspire One 756 muito feliz por um tempo agora. No entanto, toda vez que eu inicializo meu notebook, ele exibe o erro "USB 1-1.1 string descritor 0 read error -22" por algum tempo antes de continuar a inicialização. O que posso fazer para resolvê-lo?
Dmesg | grep -i usb
fornece as seguintes informações, contendo também o erro:
dmesg | grep -i usb
[ 0.470834] ACPI: bus type USB registered
[ 0.470858] usbcore: registered new interface driver usbfs
[ 0.470870] usbcore: registered new interface driver hub
[ 0.470904] usbcore: registered new device driver usb
[ 1.691475] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[ 1.691658] ehci-pci 0000:00:1a.0: new USB bus registered, assigned bus number 1
[ 1.706928] ehci-pci 0000:00:1a.0: USB 2.0 started, EHCI 1.00
[ 1.706987] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
[ 1.706990] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 1.706992] usb usb1: Product: EHCI Host Controller
[ 1.706995] usb usb1: Manufacturer: Linux 3.13.0-37-generic ehci_hcd
[ 1.706997] usb usb1: SerialNumber: 0000:00:1a.0
[ 1.707186] hub 1-0:1.0: USB hub found
[ 1.707449] ehci-pci 0000:00:1d.0: new USB bus registered, assigned bus number 2
[ 1.723005] ehci-pci 0000:00:1d.0: USB 2.0 started, EHCI 1.00
[ 1.723118] usb usb2: New USB device found, idVendor=1d6b, idProduct=0002
[ 1.723122] usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 1.723125] usb usb2: Product: EHCI Host Controller
[ 1.723127] usb usb2: Manufacturer: Linux 3.13.0-37-generic ehci_hcd
[ 1.723130] usb usb2: SerialNumber: 0000:00:1d.0
[ 1.723379] hub 2-0:1.0: USB hub found
[ 1.723537] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[ 1.723558] uhci_hcd: USB Universal Host Controller Interface driver
[ 2.018985] usb 1-1: new high-speed USB device number 2 using ehci-pci
[ 2.151334] usb 1-1: New USB device found, idVendor=8087, idProduct=0024
[ 2.151345] usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[ 2.151732] hub 1-1:1.0: USB hub found
[ 2.262898] usb 2-1: new high-speed USB device number 2 using ehci-pci
[ 2.395069] usb 2-1: New USB device found, idVendor=8087, idProduct=0024
[ 2.395080] usb 2-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[ 2.395527] hub 2-1:1.0: USB hub found
[ 2.466817] usb 1-1.1: new full-speed USB device number 3 using ehci-pci
[ 2.561291] usb 1-1.1: string descriptor 0 read error: -22
[ 2.561308] usb 1-1.1: New USB device found, idVendor=0489, idProduct=e04e
[ 2.561314] usb 1-1.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 2.630783] usb 1-1.3: new high-speed USB device number 4 using ehci-pci
[ 2.779691] usb 1-1.3: New USB device found, idVendor=04f2, idProduct=b336
[ 2.779697] usb 1-1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 2.779700] usb 1-1.3: Product: HD WebCam
[ 2.779703] usb 1-1.3: Manufacturer: HD WebCam
[ 14.088233] usbcore: registered new interface driver btusb
[ 14.090780] usbcore: registered new interface driver ath3k
[ 14.807864] input: HD WebCam as /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.3/1-1.3:1.0/input/input13
[ 14.808096] usbcore: registered new interface driver uvcvideo
[ 14.808099] USB Video Class driver (1.1.1)
[ 242.008518] usb 1-1.1: reset full-speed USB device number 3 using ehci-pci
[ 242.100420] usb 1-1.1: device firmware changed
[ 242.172321] usb 1-1.3: reset high-speed USB device number 4 using ehci-pci
[ 244.244853] usb 1-1.1: USB disconnect, device number 3
[ 244.318558] usb 1-1.1: new full-speed USB device number 5 using ehci-pci
[ 244.420076] usb 1-1.1: string descriptor 0 read error: -22
[ 244.420092] usb 1-1.1: New USB device found, idVendor=0489, idProduct=e04e
[ 244.420098] usb 1-1.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 244.799816] usb 1-1.1: USB disconnect, device number 5
[ 245.001765] usb 1-1.1: new full-speed USB device number 6 using ehci-pci
[ 245.661045] usb 1-1.1: string descriptor 0 read error: -22
[ 245.661055] usb 1-1.1: New USB device found, idVendor=0489, idProduct=e04e
[ 245.661059] usb 1-1.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
Cada dispositivo USB possui diferentes descritores com informações sobre o dispositivo, entre eles você pode encontrar "descritores de dispositivo", "descritores de configuração", "descritores de string".
Seu erro foi desencadeado por Ônibus 001 Dispositivo 005: ID 0489: e04e Foxconn / Hon Hai
Este dispositivo não pode ler o descritor de string Os descritores de strings fornecem informações legíveis e são opcionais.
Este não é o motivo da sua latência de inicialização.
Outras leituras: link