diff --git a/linux-core/drm_modes.c b/linux-core/drm_modes.c
index 0f2a612a..14c7acd5 100644
--- a/linux-core/drm_modes.c
+++ b/linux-core/drm_modes.c
@@ -129,9 +129,9 @@ void drm_mode_set_crtcinfo(struct drm_display_mode *p, int adjust_flags)
 	}
 
 	p->crtc_vblank_start = min(p->crtc_vsync_start, p->crtc_vdisplay);
-	p->crtc_vblank_end = min(p->crtc_vsync_end, p->crtc_vtotal);
+	p->crtc_vblank_end = max(p->crtc_vsync_end, p->crtc_vtotal);
 	p->crtc_hblank_start = min(p->crtc_hsync_start, p->crtc_hdisplay);
-	p->crtc_hblank_end = min(p->crtc_hsync_end, p->crtc_htotal);
+	p->crtc_hblank_end = max(p->crtc_hsync_end, p->crtc_htotal);
 
 	p->crtc_hadjusted = false;
 	p->crtc_vadjusted = false;