diff --git a/cinelerra-5.1/cinelerra/main.C b/cinelerra-5.1/cinelerra/main.C
index 0def64b7..3f123b98 100644
--- a/cinelerra-5.1/cinelerra/main.C
+++ b/cinelerra-5.1/cinelerra/main.C
@@ -168,6 +168,15 @@ int main(int argc, char *argv[])
 	batch_path[0] = 0;
 	deamon_path[0] = 0;
 	Units::init();
+
+       /* disable dri3 for non_prime, it broke hw effects on nouveau as of 26-08-2020 */
+	const char *prime = getenv("DRI_PRIME");
+	if (prime)
+	setenv("LIBGL_DRI3_DISABLE", "0", 1);
+	else
+	setenv("LIBGL_DRI3_DISABLE", "1", 1);
+
+
 	const char *lang = getenv("LANGUAGE");
 	if( lang ) lang = cstrdup(lang);
 	File::init_cin_path();