check previous mode first

diff --git a/linux-core/intel_fb.c b/linux-core/intel_fb.c
index 0a3a00b..c81e440 100644 (file)
--- a/linux-core/intel_fb.c
+++ b/linux-core/intel_fb.c
@@ -320,9 +320,11 @@ static int intelfb_set_par(struct fb_info *info)
                drm_mode_attachmode_crtc(dev, par->crtc, par->fb_mode);
        }
 
-        if (!drm_crtc_set_mode(par->crtc, drm_mode, 0, 0))
+       if (par->crtc->enabled) {
+         if (!drm_mode_equal(&par->crtc->mode, drm_mode))
+             if (!drm_crtc_set_mode(par->crtc, drm_mode, 0, 0))
                 return -EINVAL;
-
+       }
        return 0;
 }