我已经在 Acer Aspire One 756 上运行 Ubuntu 14.04 一段时间了，运行得很顺利。但是，每次启动笔记本电脑时，它都会显示错误“USB 1-1.1 字符串描述符 0 读取错误 -22”，一段时间后才会继续启动。我该如何解决它？
Dmesg | grep -i usb
提供以下信息，其中也包含错误：
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
答案1
每个 USB 设备都有不同的描述符，其中包含有关设备的信息，其中您可以找到“设备描述符”、“配置描述符”、“字符串描述符”。
您的错误是由总线 001 设备 005 触发的：ID 0489：e04e 富士康/鸿海
此设备无法读取字符串描述符字符串描述符提供人类可读的信息并且是可选的。
这不是导致启动延迟的原因。
进一步阅读：http://www.beyondlogic.org/usbnutshell/usb5.shtml#StringDescriptors