Shademode=flat does not work on Intel graphicchips

#include <acknex.h>

MATERIAL* mat1={
	effect="
	const float4x4 matWorldViewProj; // World*view*projection matrix. 
	texture entSkin1;
	
	sampler ColorMapSampler = sampler_state 
	{ 
	   Texture = <entSkin1>; 
	}; 
	
struct VS_OUTPUT
{
	float4 position : POSITION0;
	float4 color : COLOR0;
};

VS_OUTPUT DiffuseVS( 
   in float4 InPos: POSITION, 
   in float2 InTex: TEXCOORD0)
{ 
	VS_OUTPUT output;
	output.position=InPos;
   output.position = mul(output.position, matWorldViewProj); 
   output.color=tex2Dlod(ColorMapSampler,float4(InTex.xy,0.0f,0.0f));
   return output;
} 
 
float4 DiffusePS(in float4 col : COLOR0) : COLOR0
{
	return col;
}

// Technique: 
technique DiffuseTechnique 
{ 
   pass P0 
   {
   	shademode=flat;
      VertexShader = compile vs_3_0 DiffuseVS(); 
      PixelShader = compile ps_3_0 DiffusePS();
   } 
} 	
	";
	
	
	
}

void main()
{
	level_load(NULL);
	camera.x=150;
	camera.pan=180;
        //Choose a model you like here =)
	you=ent_create("player.mdl",NULLVECTOR,NULL);
	you.material=mat1;
}