opengl es Shader variables, wrong values in shader (iOS 6)

Hi all,

There is some problem with shader variables. for example

c# code:

 ...

 Shader.SetGlobalVector("test", new Vector4(1,10,100,1000));

 ...

cg code (pixel shader):

 fixed4 test;
 
 fixed4 ps_main(VS_OUTPUT) : COLOR
 {
     return test * float4(1, 0.1, 0.01, 0.001);
 }

On PC, Mac platforms output will be white color - (1*1, 0.1 10, 100 0.01, 1000 0.001) but on ipad (opengl ES 2.0, ios 6) output is red color, means that test vector set as clamped or I don't know how it was modified. (1*1, 0.1 1?, 0.01 1?, 0.001 1?)

So is there some ES standard or specification, or anything else that I can read about it.

p.s. I was working on manual fog using unity variables unity_FogStart, unity_FogEnd, etc. Unity standard fog is working ok, but mine - doesn't at all, cause unity_FogEnd.x is near 1.0 value, instead of (for example) 700.