MSI MS-6319 Manual page 39

This jumper is used to enable support for STR (Suspend to RAM). The
power supply should be have more than 750mA 5V Standby or up to be able
to enable the STR support.
JSTR
Note: Add-on VGA card must support ACPI mode, for this function
to work.
Short
Open
2-35
Function
Enabled STR
Disabled STR
JSTR