上次启动时，两个 USB 设备未通电：
- 罗技 G5 鼠标在大多数情况下都可以工作，但这次我必须将其插入（在同一主板 USB 端口中）三到四次才能启动。
- 连接到前面板的 Wi-Fi USB 适配器通常（不确定是否总是）不是在启动期间通电。
看来是这个问题是 力量 有关的，这有点神秘：所有 USB 设备每次都能在 Windows 上正常工作，我的 PSU 非常强大，更重要的是，在这个问题发生之前，我已经使用相同的硬件运行 Arch Linux 几个月了。人们建议至少禁用 USB 自动暂停，有些人建议old_scheme_first魔法设定，禁用ehci_hcd然后将其关闭然后再次打开，但在没有任何解释的情况下，我不愿意尝试“意外修复”。有谁知道一个解释清楚的解决方案或更详细地调试此问题的某种方法？apropos -a usb log没有返回任何内容，而且似乎很难知道我的 7 个以上 USB 设备中的哪一个应该受到指责。
从dmesg上次启动开始，这两个设备均未通电：
usb 4-5: device descriptor read/64, error -110
usb 4-5: new high-speed USB device number 5 using ehci-pci
usb 4-5: device descriptor read/64, error -110
usb 4-5: device descriptor read/64, error -110
usb 4-5: new high-speed USB device number 6 using ehci-pci
usb 4-5: device not accepting address 6, error -110
usb 4-5: new high-speed USB device number 7 using ehci-pci
usb 4-5: device not accepting address 7, error -110
hub 4-0:1.0: unable to enumerate USB device on port 5
usb 10-1: new full-speed USB device number 2 using uhci_hcd
usb 10-1: device descriptor read/64, error -110
usb 10-1: device descriptor read/64, error -110
usb 10-1: new full-speed USB device number 3 using uhci_hcd
usb 4-3: USB disconnect, device number 2
usb 4-3: new high-speed USB device number 8 using ehci-pci
hub 4-3:1.0: USB hub found
hub 4-3:1.0: 4 ports detected
usb 3-4: USB disconnect, device number 3
usb 3-4: new high-speed USB device number 5 using ehci-pci
usb 3-4: device not accepting address 5, error -71
usb 4-5: new high-speed USB device number 10 using ehci-pci
cfg80211: Calling CRDA to update world regulatory domain
rtl8192cu: Chip version 0x11
usb 4-3.1: new full-speed USB device number 11 using ehci-pci
rtl8192cu: MAC address: e8:4e:06:14:7a:77
rtl8192cu: Board Type 0
rtl_usb: rx_max_size 15360, rx_urb_num 8, in_ep 1
rtl8192cu: Loading firmware rtlwifi/rtl8192cufw_TMSC.bin
usbcore: registered new interface driver rtl8192cu
ieee80211 phy0: Selected rate control algorithm 'rtl_rc'
rtlwifi: wireless switch is on
systemd-udevd[695]: renamed network interface wlan0 to wlp0s29f7u5
rtl8192cu: MAC auto ON okay!
input: Microsoft X-Box 360 pad as /devices/pci0000:00/0000:00:1d.7/usb4/4-3/4-3.1/4-3.1:1.0/input/input14
usbcore: registered new interface driver xpad
rtl8192cu: Tx queue select: 0x05
usb 9-2: new full-speed USB device number 2 using uhci_hcd
hidraw: raw HID events driver (C) Jiri Kosina
usbcore: registered new interface driver usbhid
usbhid: USB HID core driver
input: Logitech USB Gaming Mouse as /devices/pci0000:00/0000:00:1d.1/usb9/9-2/9-2:1.0/0003:046D:C041.0001/input/input15
hid-generic 0003:046D:C041.0001: input,hidraw0: USB HID v1.11 Mouse [Logitech USB Gaming Mouse] on usb-0000:00:1d.1-2/input0
hid-generic 0003:046D:C041.0002: hiddev0,hidraw1: USB HID v1.11 Device [Logitech USB Gaming Mouse] on usb-0000:00:1d.1-2/input1
mousedev: PS/2 mouse device common for all mice
IPv6: ADDRCONF(NETDEV_UP): wlp0s29f7u5: link is not ready
usb 6-2: new full-speed USB device number 2 using uhci_hcd
usb 6-2: not running at top speed; connect to a high speed hub
usb-storage 6-2:1.0: USB Mass Storage device detected
scsi16 : usb-storage 6-2:1.0
wlp0s29f7u5: authenticate with cc:33:bb:13:8a:f4
wlp0s29f7u5: send auth to cc:33:bb:13:8a:f4 (try 1/3)
wlp0s29f7u5: authenticated
wlp0s29f7u5: associate with cc:33:bb:13:8a:f4 (try 1/3)
wlp0s29f7u5: RX AssocResp from cc:33:bb:13:8a:f4 (capab=0x431 status=0 aid=56)
wlp0s29f7u5: associated
IPv6: ADDRCONF(NETDEV_CHANGE): wlp0s29f7u5: link becomes ready