核心更新到 3.3.6-030306 後，我的 USB 連接埠在 Ubuntu 12.04 下停止運作。我在啟動過程中收到一條錯誤訊息“xhci_hcd 無法設定”。細節：
> dmesg | grep xhci
[ 0.906495] xhci_hcd 0000:04:00.0: found PCI INT A -> IRQ 10
[ 0.906509] xhci_hcd 0000:04:00.0: sharing IRQ 10 with 0000:00:1c.3
[ 0.906565] xhci_hcd 0000:04:00.0: xHCI Host Controller
[ 0.906600] xhci_hcd 0000:04:00.0: new USB bus registered, assigned bus number 3
[ 0.906648] xhci_hcd 0000:04:00.0: can't setup
[ 0.906652] xhci_hcd 0000:04:00.0: USB bus 3 deregistered
[ 0.906704] xhci_hcd 0000:04:00.0: init 0000:04:00.0 fail, -19
當我啟動 Windows 7 時，USB 連接埠運作正常。我有一台使用了 4 年的 Dell XPS 15z，BIOS 是當時的：
> sudo dmidecode -s bios-release-date
01/13/2012
> sudo dmidecode -s bios-version
A09
任何幫助將不勝感激，謝謝