--- src/gui/text/qfontengine_x11.cpp

+++ src/gui/text/qfontengine_x11.cpp

@@ -992,6 +992,26 @@ static bool subpixel_rendering_available()

     return (implemented = true);

 }

+#include <ft2build.h>

+#include FT_FREETYPE_H

+#include FT_LCD_FILTER_H

+

+static bool subpixel_rendering_available()

+{

+    static int implemented = -1;

+

+    if (implemented >= 0)

+        return implemented;

+

+    extern FT_Library qt_getFreetype();

+    FT_Library lib = qt_getFreetype();

+

+    if (FT_Err_Unimplemented_Feature ==

+            FT_Library_SetLcdFilter(lib, FT_LCD_FILTER_DEFAULT ))

+        return (implemented = false);

+

+    return (implemented = true);

+}

 QFontEngineX11FT::QFontEngineX11FT(FcPattern *pattern, const QFontDef &fd, int screen)

     : QFontEngineFT(fd)

@@ -1009,7 +1029,7 @@ QFontEngineX11FT::QFontEngineX11FT(FcPattern *pattern, const QFontDef &fd, int s

     canUploadGlyphsToServer = qApp->thread() == QThread::currentThread();

     subpixelType = Subpixel_None;

-    if (antialias) {

+    if (subpixel_rendering_available() && antialias) {

         int subpixel = X11->display ? X11->screens[screen].subpixel : FC_RGBA_UNKNOWN;

         if (subpixel == FC_RGBA_UNKNOWN)

             (void) FcPatternGetInteger(pattern, FC_RGBA, 0, &subpixel);