According to the board specification[1] the width of the vertical sync front porch is 12 pixels or the same as the width of the horizontal sync front porch. This in turn means the size of the lower margin is 0, because the vertical sync starts as soon as the start of the horizontal sync terminates the last line. References: [1] "PMAG-BA TURBOchannel Color Frame Buffer Functional Specification", Revision 1.2, Workstation Systems Engineering, Digital Equipment Corporation, August 27, 1990, Table 3-5: "Video Timing" Signed-off-by: Maciej W. Rozycki <macro@xxxxxxxxxxxxxx> --- linux-pmag-ba-lower.patch Index: linux-20150524-4maxp64/drivers/video/fbdev/pmag-ba-fb.c =================================================================== --- linux-20150524-4maxp64.orig/drivers/video/fbdev/pmag-ba-fb.c +++ linux-20150524-4maxp64/drivers/video/fbdev/pmag-ba-fb.c @@ -60,7 +60,7 @@ static struct fb_var_screeninfo pmagbafb .left_margin = 116, .right_margin = 12, .upper_margin = 34, - .lower_margin = 12, + .lower_margin = 0, .hsync_len = 128, .vsync_len = 3, .sync = FB_SYNC_ON_GREEN, -- To unsubscribe from this list: send the line "unsubscribe linux-fbdev" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html