diff -r ef0373b55136 -r 758a864f9613 src/opengl/qglframebufferobject.cpp
--- a/src/opengl/qglframebufferobject.cpp	Fri Sep 17 08:34:18 2010 +0300
+++ b/src/opengl/qglframebufferobject.cpp	Mon Oct 04 01:19:32 2010 +0300
@@ -445,11 +445,11 @@
         GLint maxSamples;
         glGetIntegerv(GL_MAX_SAMPLES_EXT, &maxSamples);
 
-        samples = qBound(1, int(samples), int(maxSamples));
+        samples = qBound(0, int(samples), int(maxSamples));
 
         glGenRenderbuffers(1, &color_buffer);
         glBindRenderbuffer(GL_RENDERBUFFER_EXT, color_buffer);
-        if (glRenderbufferStorageMultisampleEXT) {
+        if (glRenderbufferStorageMultisampleEXT && samples > 0) {
             glRenderbufferStorageMultisampleEXT(GL_RENDERBUFFER_EXT, samples,
                 internal_format, size.width(), size.height());
         } else {