--- drivers/video/sis/sis_main.c

+++ drivers/video/sis/sis_main.c

@@ -1701,6 +1701,9 @@ static int sisfb_ioctl(struct fb_info *i

break;

case FBIOGET_VBLANK:

+

+ memset(&sisvbblank, 0, sizeof(struct fb_vblank));

+

sisvbblank.count = 0;

sisvbblank.flags = sisfb_setupvbblankflags(ivideo, &sisvbblank.vcount, &sisvbblank.hcount);