diff --git a/plugins/GSdx/GSDeviceOGL.cpp b/plugins/GSdx/GSDeviceOGL.cpp
index 690c5a8039..fd47ee0b5f 100644
--- a/plugins/GSdx/GSDeviceOGL.cpp
+++ b/plugins/GSdx/GSDeviceOGL.cpp
@@ -186,7 +186,10 @@ bool GSDeviceOGL::Create(GSWnd* wnd)
 
 		GLuint major = s[dot-1]-'0';
 		GLuint minor = s[dot+1]-'0';
-		if ( (major < 4) || ( major == 4 && minor < 2 ) ) return false;
+		// Note: 4.2 crash on latest nvidia drivers!
+		// So only check 4.1
+		// if ( (major < 4) || ( major == 4 && minor < 2 ) ) return false;
+		if ( (major < 4) || ( major == 4 && minor < 1 ) ) return false;
 
 
 
@@ -479,7 +482,7 @@ bool GSDeviceOGL::Reset(int w, int h)
 	// Opengl allocate the backbuffer with the window. The render is done in the backbuffer when
 	// there isn't any FBO. Only a dummy texture is created to easily detect when the rendering is done
 	// in the backbuffer
-	m_backbuffer = new GSTextureOGL(0, w, h, false, GSTextureOGL::Backbuffer);
+	m_backbuffer = new GSTextureOGL(GSTextureOGL::Backbuffer, w, h, false, 0);
 
 	return true;
 }
@@ -619,8 +622,11 @@ void GSDeviceOGL::CopyRect(GSTexture* st, GSTexture* dt, const GSVector4i& r)
 		return;
 	}
 
+	// This function is useless on opengl. The only call I found copy the whole texture data to another one
 	assert(0);
+
 	// GL_NV_copy_image seem like the good extension but not supported on AMD...
+	// Maybe opengl 4.3 !
 
 	// FIXME attach the texture to the FBO
 	GSTextureOGL* st_ogl = (GSTextureOGL*) st;
diff --git a/plugins/GSdx/GSTextureOGL.cpp b/plugins/GSdx/GSTextureOGL.cpp
index 1f398f638d..f38c6ad7f7 100644
--- a/plugins/GSdx/GSTextureOGL.cpp
+++ b/plugins/GSdx/GSTextureOGL.cpp
@@ -103,6 +103,9 @@ GSTextureOGL::GSTextureOGL(int type, int w, int h, bool msaa, int format)
 			// gvec texelFetch(gsampler sampler, ivec texCoord, int lod[, int sample]);
 			// corollary we can maybe use it for multisample stuff
 			break;
+		case GSTexture::Backbuffer:
+			m_texture_target = 0;
+			m_texture_id = 0;
 		default:
 			break;
 	}
diff --git a/plugins/GSdx/GSWnd.cpp b/plugins/GSdx/GSWnd.cpp
index 3ef9cf3c2b..cefeba6e55 100644
--- a/plugins/GSdx/GSWnd.cpp
+++ b/plugins/GSdx/GSWnd.cpp
@@ -370,10 +370,12 @@ bool GSWnd::Attach(void* handle, bool managed)
 		int context_attribs[] =
 		{
 			GLX_CONTEXT_MAJOR_VERSION_ARB, 4,
-			GLX_CONTEXT_MINOR_VERSION_ARB, 2,
+			// Note: 4.2 crash on latest nvidia drivers!
+			GLX_CONTEXT_MINOR_VERSION_ARB, 1,
 			// FIXME : Request a debug context to ease opengl development
 			// Note: don't support deprecated feature (pre openg 3.1)
-			GLX_CONTEXT_FLAGS_ARB, GLX_CONTEXT_DEBUG_BIT_ARB | GLX_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB,
+			//GLX_CONTEXT_FLAGS_ARB, GLX_CONTEXT_DEBUG_BIT_ARB | GLX_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB,
+			GLX_CONTEXT_FLAGS_ARB, GLX_CONTEXT_DEBUG_BIT_ARB,
 			None
 		};
 		m_context = glXCreateContextAttribsARB(m_XDisplay, fbc[0], 0, true, context_attribs);
diff --git a/plugins/GSdx/res/tfx.glsl b/plugins/GSdx/res/tfx.glsl
index 11f50b8b98..1a47366e48 100644
--- a/plugins/GSdx/res/tfx.glsl
+++ b/plugins/GSdx/res/tfx.glsl
@@ -74,13 +74,11 @@ void vs_main()
 {
     uint z;
 	if(VS_BPPZ == 1) // 24
-	{
 		z = i_z & 0xffffff; 
-	}
 	else if(VS_BPPZ == 2) // 16
-	{
 		z = i_z & 0xffff;
-	}
+    else
+        z = i_z;
 
 	// pos -= 0.05 (1/320 pixel) helps avoiding rounding problems (integral part of pos is usually 5 digits, 0.05 is about as low as we can go)
 	// example: ceil(afterseveralvertextransformations(y = 133)) => 134 => line 133 stays empty
@@ -371,7 +369,7 @@ mat4 sample_4p(vec4 u)
 
 vec4 sample_color(vec2 st, float q)
 {
-	if(!PS_FST)
+	if(PS_FST == 0)
 	{
 		st /= q;
 	}