diff --git a/src/video/vid_mga.c b/src/video/vid_mga.c
index 5a1d7a4b5..8ac16f2d6 100644
--- a/src/video/vid_mga.c
+++ b/src/video/vid_mga.c
@@ -691,6 +691,8 @@ mystique_out(uint16_t addr, uint8_t val, void *p)
 	case 0x3df:
 		if (mystique->crtcext_idx < 6)
 			mystique->crtcext_regs[mystique->crtcext_idx] = val;
+		if (mystique->crtcext_idx == 1)
+			svga->dpms = !!(val & 0x30);
 		if (mystique->crtcext_idx < 4) {
 			svga->fullchange = changeframecount;
 			svga_recalctimings(svga);