![如何重置 USB 控制器?](https://linux22.com/image/206493/%E5%A6%82%E4%BD%95%E9%87%8D%E7%BD%AE%20USB%20%E6%8E%A7%E5%88%B6%E5%99%A8%EF%BC%9F.png)
当我插入连接有鼠标和键盘的无名 USB 2.0 集线器时,计算机上的 USB 端口停止工作:不再检测到连接到它的设备,无论是通过集线器还是直接连接。
系统重新启动可以使端口再次工作,但我宁愿采用不那么严厉的方法,只“重置”USB 控制器。
答案1
我写了一个适合我的脚本(在 Debian 11 上):
#!/usr/bin/env bash
# Resets all USB host controllers of the system.
# This is useful in case one stopped working
# due to a faulty device having been connected to it.
base="/sys/bus/pci/drivers"
sleep_secs="1"
# This might find a sub-set of these:
# * 'ohci_hcd' - USB 3.0
# * 'ehci-pci' - USB 2.0
# * 'xhci_hcd' - USB 3.0
echo "Looking for USB standards ..."
for usb_std in "$base/"?hci[-_]?c*
do
echo "* USB standard '$usb_std' ..."
for dev_path in "$usb_std/"*:*
do
dev="$(basename "$dev_path")"
echo " - Resetting device '$dev' ..."
printf '%s' "$dev" | sudo tee "$usb_std/unbind" > /dev/null
sleep "$sleep_secs"
printf '%s' "$dev" | sudo tee "$usb_std/bind" > /dev/null
echo " done."
done
echo " done."
done
echo "done."
笔记:
- 它需要 root 访问权限才能重置控制器。
想法取自: https://www.linux.org/threads/resetting-the-usb-subsystem.10404/