MSI LPX ZX4 User Manual page 32

The JKB jumper is for setting keyboard power. This function should be set
in the BIOS for the keyboard and PS/2 mouse Wake-up function.
5V Standby
Enable keyboard
power on function
Note: To be able to use this function, you need a power supply that
provide enough power for this feature.
(Power supply with 750 ma 5V Stand-by)
1
3
1
3
5V (default)
Disable keyboard
power on function
2-27
1
3
JKB