连接到我的香蕉 pi 的蓝牙适配器突然从 USB 设备列表中消失。 Lsusb 根本没有显示它，但这也许很有趣，来自 dmesg 的一段：
[ 14.777099] udevd[167]: starting version 175 [ 17.763916] usb 1-1.3: device descriptor read/64, error -110 [ 32.983934] usb 1-1.3: device descriptor read/64, error -110 [ 33.204856] usb 1-1.3: new full-speed USB device number 4 using sw-ehci [ 48.313924] usb 1-1.3: device descriptor read/64, error -110 [ 63.533915] usb 1-1.3: device descriptor read/64, error -110 [ 63.754857] usb 1-1.3: new full-speed USB device number 5 using sw-ehci [ 74.184102] usb 1-1.3: device not accepting address 5, error -110 [ 74.294880] usb 1-1.3: new full-speed USB device number 6 using sw-ehci [ 84.724105] usb 1-1.3: device not accepting address 6, error -110 [ 84.741575] hub 1-1:1.0: unable to enumerate USB device on port 3
lsusb -t 给出：
/: Bus 04.Port 1: Dev 1, Class=root_hub, Driver=sw-ohci/1p, 12M /: Bus 03.Port 1: Dev 1, Class=root_hub, Driver=sw-ehci/1p, 480M /: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=sw-ohci/1p, 12M /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=sw-ehci/1p, 480M |__ Port 1: Dev 2, If 0, Class=hub, Driver=hub/4p, 480M |__ Port 4: Dev 7, If 0, Class=vend., Driver=rtl8812au, 480M
而“正常”lsusb 给出：
Bus 001 Device 002: ID 1a40:0101 Terminus Technology Inc. 4-Port HUB Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 001 Device 007: ID 7392:a812 Edimax Technology Co., Ltd
我在 Banana Pi 1 上使用 Linux 版本 3.4.104-bananian。
我怎样才能退回这个设备。去那里是不可能的，因为它安装得很高......
答案1
好吧，就我而言，问题是通过加载由于某种原因丢失的 btusb 模块解决的。
所以：
modprobe btusb reboot