1 files changed, 24 insertions, 4 deletions

diff --git a/drivers/video/fbmon.c b/drivers/video/fbmon.c
index fbbcb7156a34..87b0224d2347 100644
--- a/drivers/video/fbmon.c
+++ b/drivers/video/fbmon.c
@@ -605,6 +605,7 @@ static int fb_get_monitor_limits(unsigned char *edid, struct fb_monspecs *specs)
         block = edid + DETAILED_TIMING_DESCRIPTIONS_START;
 
         DPRINTK("      Monitor Operating Limits: ");
+
         for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {
                 if (edid_is_limits_block(block)) {
                         specs->hfmin = H_MIN_RATE * 1000;
@@ -618,11 +619,12 @@ static int fb_get_monitor_limits(unsigned char *edid, struct fb_monspecs *specs)
                         break;
                 }
         }
-        
+
         /* estimate monitor limits based on modes supported */
         if (retval) {
-                struct fb_videomode *modes;
+                struct fb_videomode *modes, *mode;
                 int num_modes, i, hz, hscan, pixclock;
+                int vtotal, htotal;
 
                 modes = fb_create_modedb(edid, &num_modes);
                 if (!modes) {
@@ -632,20 +634,38 @@ static int fb_get_monitor_limits(unsigned char *edid, struct fb_monspecs *specs)
 
                 retval = 0;
                 for (i = 0; i < num_modes; i++) {
-                        hz = modes[i].refresh;
+                        mode = &modes[i];
                         pixclock = PICOS2KHZ(modes[i].pixclock) * 1000;
-                        hscan = (modes[i].yres * 105 * hz + 5000)/100;
+                        htotal = mode->xres + mode->right_margin + mode->hsync_len
+                                + mode->left_margin;
+                        vtotal = mode->yres + mode->lower_margin + mode->vsync_len
+                                + mode->upper_margin;
+
+                        if (mode->vmode & FB_VMODE_INTERLACED)
+                                vtotal /= 2;
+
+                        if (mode->vmode & FB_VMODE_DOUBLE)
+                                vtotal *= 2;
+
+                        hscan = (pixclock + htotal / 2) / htotal;
+                        hscan = (hscan + 500) / 1000 * 1000;
+                        hz = (hscan + vtotal / 2) / vtotal;
                         
                         if (specs->dclkmax == 0 || specs->dclkmax < pixclock)
                                 specs->dclkmax = pixclock;
+
                         if (specs->dclkmin == 0 || specs->dclkmin > pixclock)
                                 specs->dclkmin = pixclock;
+
                         if (specs->hfmax == 0 || specs->hfmax < hscan)
                                 specs->hfmax = hscan;
+
                         if (specs->hfmin == 0 || specs->hfmin > hscan)
                                 specs->hfmin = hscan;
+
                         if (specs->vfmax == 0 || specs->vfmax < hz)
                                 specs->vfmax = hz;
+
                         if (specs->vfmin == 0 || specs->vfmin > hz)
                                 specs->vfmin = hz;
                 }