LOD Bias Ext problem

[Reckoner]

If I set a value for LOD Bias with:
glTexEnvf(GL_TEXTURE_FILTER_CONTROL_EXT, GL_TEXTURE_LOD_BIAS_EXT, fValue);

it works great but after a call to:

glPushAttrib(GL_TEXTURE_BIT);
...
glPopAttrib( );

it is set back to 0.0. Any ideas?

Reckoner
Geforce3, 28.32

[Reckoner]

It doesn't happen on ATI 8500. Must be a bug on the nVidia driver.

Reckoner