我最近购买了一台预装 Windows 8.1 的华硕 Q550LF 笔记本电脑，随后安装了 Ubuntu 14.04 和 Debian 7.6。我使用 Ubuntu 来完成大多数任务，但偶尔也有理由启动 Debian。问题是 Debian 无法启动。在启动过程中的某个时刻，我收到以下错误消息的变体：
[time] usb 1-7: unable to read config index 0 descriptor/start: -71
[time] usb 1-7: can't read configurations, error -71
[time] usb 1-7: unable to read config index 0 descriptor/start: -110
[time] usb 1-7: can't read configurations, error -110
它们无限期地重复，并且引导过程挂起。我在 Windows 或 Ubuntu 中的触摸屏没有问题，所以我怀疑 Debian 有问题。启动 Ubuntu 时会出现相同的错误消息，但最终可以识别触摸屏：
$ lsusb
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 006: ID 0bda:0139 Realtek Semiconductor Corp. RTS5139 Card Reader Controller
Bus 001 Device 023: ID 04f3:010c Elan Microelectronics Corp.
Bus 001 Device 004: ID 13d3:5188 IMC Networks
Bus 001 Device 003: ID 8087:07dc Intel Corp.
Bus 001 Device 002: ID 046d:c00c Logitech, Inc. Optical Wheel Mouse
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
$ dmesg -k | grep 'usb 1-7'
[ 1.685457] usb 1-7: new full-speed USB device number 5 using xhci_hcd
[ 1.702858] usb 1-7: New USB device found, idVendor=04f3, idProduct=010c
[ 1.702862] usb 1-7: New USB device strings: Mfr=4, Product=14, SerialNumber=0
[ 1.702864] usb 1-7: Product: Touchscreen
[ 1.702866] usb 1-7: Manufacturer: ELAN
[ 1.703007] usb 1-7: ep 0x2 - rounding interval to 64 microframes, ep desc says 80 microframes
[ 3.822847] usb 1-7: USB disconnect, device number 5
[ 4.095373] usb 1-7: new full-speed USB device number 7 using xhci_hcd
[ 6.233335] usb 1-7: unable to read config index 0 descriptor/start: -71
[ 6.233371] usb 1-7: can't read configurations, error -71
[ 6.345226] usb 1-7: new full-speed USB device number 8 using xhci_hcd
[ 8.483093] usb 1-7: unable to read config index 0 descriptor/start: -71
[ 8.483135] usb 1-7: can't read configurations, error -71
[ 8.594952] usb 1-7: new full-speed USB device number 9 using xhci_hcd
[ 10.733650] usb 1-7: unable to read config index 0 descriptor/start: -71
[ 10.733688] usb 1-7: can't read configurations, error -71
[ 10.900889] usb 1-7: new full-speed USB device number 10 using xhci_hcd
[ 13.040048] usb 1-7: unable to read config index 0 descriptor/start: -71
[ 13.040053] usb 1-7: can't read configurations, error -71
[ 13.318826] usb 1-7: new full-speed USB device number 11 using xhci_hcd
[ 13.336201] usb 1-7: New USB device found, idVendor=04f3, idProduct=010c
[ 13.336202] usb 1-7: New USB device strings: Mfr=4, Product=14, SerialNumber=0
[ 13.336204] usb 1-7: Product: Touchscreen
[ 13.336205] usb 1-7: Manufacturer: ELAN
[ 13.336354] usb 1-7: ep 0x2 - rounding interval to 64 microframes, ep desc says 80 microframes
[ 15.458888] usb 1-7: USB disconnect, device number 11
[ 15.788782] usb 1-7: new full-speed USB device number 12 using xhci_hcd
[ 15.806165] usb 1-7: New USB device found, idVendor=04f3, idProduct=010c
[ 15.806169] usb 1-7: New USB device strings: Mfr=4, Product=14, SerialNumber=0
[ 15.806171] usb 1-7: Product: Touchscreen
[ 15.806173] usb 1-7: Manufacturer: ELAN
[ 15.806291] usb 1-7: ep 0x2 - rounding interval to 64 microframes, ep desc says 80 microframes
[ 17.928881] usb 1-7: USB disconnect, device number 12
[ 18.218822] usb 1-7: new full-speed USB device number 13 using xhci_hcd
[ 18.236215] usb 1-7: New USB device found, idVendor=04f3, idProduct=010c
[ 18.236218] usb 1-7: New USB device strings: Mfr=4, Product=14, SerialNumber=0
[ 18.236221] usb 1-7: Product: Touchscreen
[ 18.236222] usb 1-7: Manufacturer: ELAN
[ 18.236328] usb 1-7: ep 0x2 - rounding interval to 64 microframes, ep desc says 80 microframes
[ 20.359363] usb 1-7: USB disconnect, device number 13
[ 21.265243] usb 1-7: new full-speed USB device number 14 using xhci_hcd
[ 21.283198] usb 1-7: New USB device found, idVendor=04f3, idProduct=010c
[ 21.283203] usb 1-7: New USB device strings: Mfr=4, Product=14, SerialNumber=0
[ 21.283205] usb 1-7: Product: Touchscreen
[ 21.283207] usb 1-7: Manufacturer: ELAN
[ 21.283339] usb 1-7: ep 0x2 - rounding interval to 64 microframes, ep desc says 80 microframes
[ 23.406502] usb 1-7: USB disconnect, device number 14
[ 23.687181] usb 1-7: new full-speed USB device number 15 using xhci_hcd
[ 25.828401] usb 1-7: unable to read config index 0 descriptor/start: -71
[ 25.828406] usb 1-7: can't read configurations, error -71
[ 25.993113] usb 1-7: new full-speed USB device number 16 using xhci_hcd
[ 28.134506] usb 1-7: unable to read config index 0 descriptor/start: -71
[ 28.134512] usb 1-7: can't read configurations, error -71
[ 28.298972] usb 1-7: new full-speed USB device number 17 using xhci_hcd
[ 30.440820] usb 1-7: unable to read config index 0 descriptor/start: -71
[ 30.440825] usb 1-7: can't read configurations, error -71
[ 30.552709] usb 1-7: new full-speed USB device number 18 using xhci_hcd
[ 32.694248] usb 1-7: unable to read config index 0 descriptor/start: -71
[ 32.694253] usb 1-7: can't read configurations, error -71
[ 32.970694] usb 1-7: new full-speed USB device number 19 using xhci_hcd
[ 35.111542] usb 1-7: unable to read config index 0 descriptor/start: -71
[ 35.111546] usb 1-7: can't read configurations, error -71
[ 35.276520] usb 1-7: new full-speed USB device number 20 using xhci_hcd
[ 37.417528] usb 1-7: unable to read config index 0 descriptor/start: -71
[ 37.417533] usb 1-7: can't read configurations, error -71
[ 37.582405] usb 1-7: new full-speed USB device number 21 using xhci_hcd
[ 39.723735] usb 1-7: unable to read config index 0 descriptor/start: -71
[ 39.723740] usb 1-7: can't read configurations, error -71
[ 39.888351] usb 1-7: new full-speed USB device number 22 using xhci_hcd
[ 47.031720] usb 1-7: unable to read config index 0 descriptor/start: -110
[ 47.031725] usb 1-7: can't read configurations, error -110
[ 47.271826] usb 1-7: new full-speed USB device number 23 using xhci_hcd
[ 47.289529] usb 1-7: New USB device found, idVendor=04f3, idProduct=010c
[ 47.289534] usb 1-7: New USB device strings: Mfr=4, Product=14, SerialNumber=0
[ 47.289536] usb 1-7: Product: Touchscreen
[ 47.289538] usb 1-7: Manufacturer: ELAN
[ 47.289666] usb 1-7: ep 0x2 - rounding interval to 64 microframes, ep desc says 80 microframes
我无法在 BIOS 中禁用触摸屏，并且我在研究该问题时遇到的大多数所谓的解决方案都不起作用。我什至不确定我将如何解决这个问题。如果有人能指出我正确的方向，我将不胜感激。提前致谢！
答案1
当所有设备都已连接时，每个 USB 设备是否都有足够的电量来完成它想做的事情？如果断开所有其他 USB 设备，它还能工作吗？