[mutter] crtc/kms: Don't add gamma to the update if unsupported by the CRTC

[Marge Bot <marge-bot src gnome org>]

commit be9deeba09712df0a8a32769380f3f8618825cee
Author: Daniel van Vugt <daniel van vugt canonical com>
Date:   Tue Apr 12 18:37:29 2022 +0800

    crtc/kms: Don't add gamma to the update if unsupported by the CRTC
    
    Closes: https://gitlab.gnome.org/GNOME/mutter/-/issues/2197
    Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2360>

 src/backends/native/meta-crtc-kms.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)
---
diff --git a/src/backends/native/meta-crtc-kms.c b/src/backends/native/meta-crtc-kms.c
index 584a780ba8..ad72dba645 100644
--- a/src/backends/native/meta-crtc-kms.c
+++ b/src/backends/native/meta-crtc-kms.c
@@ -213,10 +213,14 @@ meta_crtc_kms_maybe_set_gamma (MetaCrtcKms   *crtc_kms,
   MetaKms *kms = meta_kms_device_get_kms (kms_device);
   MetaKmsUpdate *kms_update;
   MetaKmsCrtcGamma *gamma;
+  MetaKmsCrtc *kms_crtc = meta_crtc_kms_get_kms_crtc (crtc_kms);
 
   if (crtc_kms->is_gamma_valid)
     return;
 
+  if (!meta_kms_crtc_has_gamma (kms_crtc))
+    return;
+
   gamma = meta_monitor_manager_native_get_cached_crtc_gamma (monitor_manager_native,
                                                              crtc_kms);
   if (!gamma)
@@ -224,7 +228,7 @@ meta_crtc_kms_maybe_set_gamma (MetaCrtcKms   *crtc_kms,
 
   kms_update = meta_kms_ensure_pending_update (kms, kms_device);
   meta_kms_update_set_crtc_gamma (kms_update,
-                                  meta_crtc_kms_get_kms_crtc (crtc_kms),
+                                  kms_crtc,
                                   gamma->size,
                                   gamma->red,
                                   gamma->green,