backend/drm: request page-flip event on modeset

The old drm_connector_set_mode() function did that by calling
drm_crtc_page_flip(). We lost this in the refactoring.

Fixes: f216e979836a ("backend/drm: drop drm_connector_set_mode()")

1 files changed, 3 insertions, 0 deletions

diff --git a/backend/drm/drm.c b/backend/drm/drm.c
index a85373ad..04994c68 100644
--- a/backend/drm/drm.c
+++ b/backend/drm/drm.c
@@ -577,6 +577,9 @@ bool drm_connector_commit_state(struct wlr_drm_connector *conn,
 			return false;
 		}
 	}
+	if (pending.modeset) {
+		flags |= DRM_MODE_PAGE_FLIP_EVENT;
+	}
 
 	if (!drm_crtc_commit(conn, &pending, flags, false)) {
 		return false;