4 files changed, 8 insertions, 1 deletions
diff --git a/src/opengl/gl2paintengineex/qtextureglyphcache_gl.cpp b/src/opengl/gl2paintengineex/qtextureglyphcache_gl.cpp
index 1b879c3..ba311c3 100644
--- a/src/opengl/gl2paintengineex/qtextureglyphcache_gl.cpp
+++ b/src/opengl/gl2paintengineex/qtextureglyphcache_gl.cpp
@@ -323,6 +323,9 @@ int QGLTextureGlyphCache::maxTextureWidth() const
 
 int QGLTextureGlyphCache::maxTextureHeight() const
 {
-    return ctx->d_ptr->maxTextureSize();
+    if (ctx->d_ptr->workaround_brokenTexSubImage)
+        return qMin(1024, ctx->d_ptr->maxTextureSize());
+    else
+        return ctx->d_ptr->maxTextureSize();
 }
 QT_END_NAMESPACE
diff --git a/src/opengl/qgl.cpp b/src/opengl/qgl.cpp
index 18f1203..9bf879a 100644
--- a/src/opengl/qgl.cpp
+++ b/src/opengl/qgl.cpp
@@ -1706,6 +1706,7 @@ void QGLContextPrivate::init(QPaintDevice *dev, const QGLFormat &format)
     active_engine = 0;
     workaround_needsFullClearOnEveryFrame = false;
     workaround_brokenFBOReadBack = false;
+    workaround_brokenTexSubImage = false;
     workaroundsCached = false;
 
     workaround_brokenTextureFromPixmap = false;
diff --git a/src/opengl/qgl_egl.cpp b/src/opengl/qgl_egl.cpp
index 8902099..6f9e39c 100644
--- a/src/opengl/qgl_egl.cpp
+++ b/src/opengl/qgl_egl.cpp
@@ -204,6 +204,8 @@ void QGLContext::makeCurrent()
                 const char *egl_version = eglQueryString(d->eglContext->display(), EGL_VERSION);
                 if (egl_version && strstr(egl_version, "1.3"))
                     d->workaround_brokenFBOReadBack = true;
+                else if (egl_version && strstr(egl_version, "1.4"))
+                    d->workaround_brokenTexSubImage = true;
             }
         }
     }
diff --git a/src/opengl/qgl_p.h b/src/opengl/qgl_p.h
index b46d428..bf830ba 100644
--- a/src/opengl/qgl_p.h
+++ b/src/opengl/qgl_p.h
@@ -401,6 +401,7 @@ public:
     // workarounds for driver/hw bugs on different platforms
     uint workaround_needsFullClearOnEveryFrame : 1;
     uint workaround_brokenFBOReadBack : 1;
+    uint workaround_brokenTexSubImage : 1;
     uint workaroundsCached : 1;
 
     uint workaround_brokenTextureFromPixmap : 1;