Contec IPC Series User Manual page 66

Item
USB2 Link Power Management
USB2.0 (EHCI) Support
CAUTION
Do not set both USB3.0(XHCI) and USB2.0(EHCI) to Disabled simultaneously.
Doing so fails USB devices such as a mouse or the keyboard to function and it leads to the repair.
PT-956SxX Series User's manual
Option
Enabled
Disabled
Enabled
Disabled
Description
Do not change this setting.
Configuration can be done only when the
USB3.0 is set to Disabled.
When the USB3.0 is set to Disabled, be certain
to set this to Enabled.
5. BIOS Setup
59