- monitor-get-edid-using-vbe:

  o stop retrieval when a retrieved EDID extension block appears
    identical to the main EDID block (observed with Onkyo TX-SR607 A/V
    receiver)

2 files changed, 9 insertions, 0 deletions

diff --git a/NEWS b/NEWS
index 8195353..9bc88b7 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,8 @@
+- monitor-get-edid-using-vbe:
+  o stop retrieval when a retrieved EDID extension block appears
+    identical to the main EDID block (observed with Onkyo TX-SR607 A/V
+    receiver)
+
 Version 3.0 - 3 January 2010, by Anssi Hannula
 
 - monitor-get-edid-using-vbe:
diff --git a/vbe.c b/vbe.c
index fcd9d7f..f79187f 100644
--- a/vbe.c
+++ b/vbe.c
@@ -300,6 +300,10 @@ int get_edid(char *edid, int port, int skip_vbe_check)
       log_err("EDID: Failure reading extension block %d\n", i);
       break;
     }
+    if (memcmp(edid, edid + i * EDID_BLOCK_SIZE, EDID_BLOCK_SIZE) == 0) {
+      log_err("EDID: Extension block %d is identical to main EDID block, stopping retrieval\n", i);
+      break;
+    }
   }
 
   return i * EDID_BLOCK_SIZE;