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Problems with creating a float pbuffer with CGL/AGL

Hi,
I have been trying to get a float pbuffer working on my powerbook (radeon 9600). I can create a pbuffer in either CGL or AGL without any problems, but they seem to be clamped between 0 and 1. The values are still floats (ie. they aren't fractions of 255), but clamped.
The simplest test was to do a glClear with negative color values or values >1. In linux i get proper values from a readback, but in OSX they are clamped.

Is it possible to get non-clamped values from a pbuffer in OSX?

Here's the code i use to create the buffers:

CGLPBufferObj _hPBuffer;
CGLContextObj _hPBContext;
 _hPBscreen;

 activatePBuffer(){
CGLSetCurrentContext(_hPBContext);
CGLSetPBuffer(_hPBContext, _hPBuffer, , , _hPBscreen);
}

 createPBuffer( width, height){
CGLPixelFormatAttribute attribs[];
GLint ind = ;
ATTR_ADD(kCGLPFAAllRenderers);
ATTR_ADD(kCGLPFAColorFloat);
ATTR_ADDV(kCGLPFAColorSize, );
ATTR_ADD(kCGLPFAAccelerated);
ATTR_ADD(kCGLPFANoRecovery);
ATTR_ADD(kCGLPFAPBuffer);
ATTR_ADD(AGL_NONE);

 nScreens=;
CGLPixelFormatObj pix;
CGLChoosePixelFormat( attribs, &pix, &nScreens );
CGLCreateContext( pix, , &_hPBContext);
CGLError err = CGLCreatePBuffer(width, height, GL_TEXTURE_RECTANGLE_ARB, GL_RGBA, , &_hPBuffer);
printf("Failed to create pbuffer? %i\n", err);
CGLGetVirtualScreen(_hPBContext, &_hPBscreen);
}

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