MSI MS-6301 Manual page 43

This jumper is used to enabled support for STR(suspend to RAM). The
power supply should be more than 750mA or up to be able to enabled the
STR support.
JSTR
Note: Add-on VGA card must support ACPI mode, for this function
to work.
Short Enabled STR
Disabled STR
Open
2-38
JSTR
Function