上次啟動時，兩台 USB 裝置未通電：
- Logitech G5 滑鼠在大多數情況下都可以工作，但這次我必須將其插入（在同一主機板 USB 連接埠中）三到四次才能啟動。
- 連接到前面板的 Wi-Fi USB 轉接器通常（不確定是否總是）不是在啟動期間通電。
看來是這個問題是 力量 有關的，這有點神秘：所有 USB 設備每次都能在 Windows 上正常工作，我的 PSU 非常強大，更重要的是，在出現此問題之前，我已經使用相同的硬體運行 Arch Linux 幾個月了。人們建議至少停用 USB 自動暫停，有些人建議old_scheme_first魔法設定，停用ehci_hcd然後將其關閉然後再次打開，但在沒有任何解釋的情況下，我不願意嘗試“意外修復”。有誰知道一個解釋清楚的解決方案或更詳細地調試此問題的某種方法？apropos -a usb log沒有返回任何內容，而且似乎很難知道我的 7 個以上 USB 設備中的哪一個應該受到指責。
從dmesg上次啟動開始，這兩台設備均未通電：
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