問題描述
這款USB Hub是綠聯出的1轉7帶供電的白色款。
在lsusb中顯示為
Bus 004 Device 023: ID 05e3:0616 Genesys Logic, Inc. hub
Bus 004 Device 022: ID 05e3:0612 Genesys Logic, Inc. Hub在插入後dmesg輸出
[ 1855.415644] usb 4-1: new SuperSpeed USB device number 24 using xhci_hcd
[ 1855.439522] hub 4-1:1.0: USB hub found
[ 1855.439901] hub 4-1:1.0: 4 ports detected
[ 1855.555367] usb 3-1: new full-speed USB device number 39 using xhci_hcd
[ 1855.678791] usb 3-1: device descriptor read/64, error -71
[ 1855.908781] usb 3-1: device descriptor read/64, error -71
[ 1856.092320] usb 4-1.3: new SuperSpeed USB device number 25 using xhci_hcd
[ 1856.116606] hub 4-1.3:1.0: USB hub found
[ 1856.116891] hub 4-1.3:1.0: 4 ports detected
[ 1856.232072] usb 3-1: new full-speed USB device number 40 using xhci_hcd
[ 1856.355388] usb 3-1: device descriptor read/64, error -71
[ 1856.588724] usb 3-1: device descriptor read/64, error -71
[ 1856.695447] usb usb3-port1: attempt power cycle
[ 1857.338707] usb 3-1: new full-speed USB device number 41 using xhci_hcd
[ 1857.338834] usb 3-1: Device not responding to setup address.
[ 1857.548835] usb 3-1: Device not responding to setup address.
[ 1857.755378] usb 3-1: device not accepting address 41, error -71
[ 1857.878748] usb 3-1: new full-speed USB device number 42 using xhci_hcd
[ 1857.878928] usb 3-1: Device not responding to setup address.
[ 1858.085480] usb 3-1: Device not responding to setup address.
[ 1858.292078] usb 3-1: device not accepting address 42, error -71
[ 1858.292115] usb usb3-port1: unable to enumerate USB device解決方法
- 筆記本供電不足，需要連線筆記本電源
這個問題研究了幾個小時看了很多資料，也有帖子提到了供電，我也連線了額外的5v電源。直到筆記本提示電量不足，才真正解決。
其他
看了很多帖子，都有提到修改usbcore的配置，具體也沒有測試，可能對讀者有些幫助。
http://www.guyrutenberg.com/2008/06/26/usb-1-4-device-descriptor-read64-error-71/
http://blog.csdn.net/kenny_wju/article/details/9091395
中都有提到echo Y > /sys/module/usbcore/parameters/old_scheme_first，設定為優先使用舊的相容方案。