From ba0e3f4f83adb259822f21dc861919617a4422b4 Mon Sep 17 00:00:00 2001
From: Andrei Karas <akaras@inbox.ru>
Date: Sat, 28 Jun 2014 19:29:33 +0300
Subject: Fix vsync control for MESA drivers.

---
 src/client.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/client.cpp b/src/client.cpp
index 1ec0c683d..af30e20b3 100644
--- a/src/client.cpp
+++ b/src/client.cpp
@@ -510,13 +510,17 @@ void Client::updateEnv()
 
 #ifndef WIN32
     const int vsync = config.getIntValue("vsync");
+    // __GL_SYNC_TO_VBLANK is nvidia variable.
+    // vblank_mode is MESA variable.
     switch (vsync)
     {
         case 1:
             Client::setEnv("__GL_SYNC_TO_VBLANK", "0");
+            Client::setEnv("vblank_mode", "0");
             break;
         case 2:
             Client::setEnv("__GL_SYNC_TO_VBLANK", "1");
+            Client::setEnv("vblank_mode", "1");
             break;
         default:
             break;
-- 
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