From 403af2206196d649e21a8a75eb2ba5093bb8f00b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Daniel=20Ekl=C3=B6f?= <daniel@ekloef.se>
Date: Wed, 1 Jan 2020 16:09:16 +0100
Subject: [PATCH] wayland: warn when presentation timings have been requested
 but is not supported

---
 wayland.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/wayland.c b/wayland.c
index 30c224d5..cbd49179 100644
--- a/wayland.c
+++ b/wayland.c
@@ -578,6 +578,10 @@ wayl_init(const struct config *conf, struct fdm *fdm)
     if (wayl->primary_selection_device_manager == NULL)
         LOG_WARN("no primary selection available");
 
+    if (conf->presentation_timings && wayl->presentation == NULL)
+        LOG_WARN("presentation time interface not implemented by compositor; "
+                 "timings will not be available");
+
     tll_foreach(wayl->monitors, it) {
         LOG_INFO(
             "%s: %dx%d+%dx%d@%dHz %s (%.2f\", PPI=%dx%d, scale=%d)",