compositor-drm: Only request vblank events if needed
If the sprite is disabled and we're not enabling it on the next frame,
nothing is done in the vblank handler, so there's no need to ask for a
vblank event.
diff --git a/src/compositor-drm.c b/src/compositor-drm.c
index ee57bf0..3a7d432 100644
--- a/src/compositor-drm.c
+++ b/src/compositor-drm.c
@@ -391,7 +391,8 @@
.request.sequence = 1,
};
- if (!drm_sprite_crtc_supported(output_base, s->possible_crtcs))
+ if ((!s->fb_id && !s->pending_fb_id) ||
+ !drm_sprite_crtc_supported(output_base, s->possible_crtcs))
continue;
ret = drmModeSetPlane(compositor->drm.fd, s->plane_id,