Intel D15343-003 - Manual (Page 84)

Intel
®
82854 Graphics Memory Controller Hub (GMCH)
84 D15343-003
10 Reserved .
9:1 Reserved
0 Power State S1/S3 Refresh Control :
0 = Normal Operation, Pending refreshes are not completed before entering Self Refresh for S1/
S3.
1 = All Pending Refreshes plus one extra is performed before entering Self Refresh for S1/S3.