| Symptom | Likely Cause | Dell-Specific Fix | |---------|--------------|-------------------| | USB 3.0 drives work at USB 2.0 speeds | Legacy USB support enabled in BIOS | Disable “Legacy USB Support” → keep “Enable USB 3.0” | | Port stops working after sleep | Power management (Windows) | Device Manager → xHCI → Power Management → uncheck “Allow computer to turn off” | | Error 10 (cannot start) in Device Manager | Corrupt driver or conflicting Intel MEI driver | Run Dell Command Update; reinstall chipset driver | | External USB hub disconnects randomly | xHCI hand-off issue | BIOS → “XHCI Hand-off” → Enabled | | “USB Controller Resources Exhausted” | Too many isochronous devices (audio/video) | Increase PCI buffer (Dell Precision BIOS) |
Dell provides specific driver packages based on the controller's manufacturer (usually Intel or ASMedia): usb if xhci usb host controller dell
USB 3.0 and newer devices can reach their maximum theoretical speeds. | Symptom | Likely Cause | Dell-Specific Fix