this issue happens on G965 GM965
define 6 user defined clip planes as follow:
GL_CLIP_PLANE0 x-25=0
GL_CLIP_PLANE1 -x+50=0
GL_CLIP_PLANE2 y-20=0
GL_CLIP_PLANE3 -y+60=0
GL_CLIP_PLANE4 z-0.2=0
GL_CLIP_PLANE5 -z+0.6=0
first enable CLIP_PLANE0, CLIP_PLANE1, CLIP_PLANE2 (with others disabled), draw a point at (10.5, 15.5, 0.1), this point should be clipped out, it does work well.

but then, disable CLIP_PLANE0, CLIP_PLANE1, CLIP_PLANE2, and enable CLIP_PLANE3
draw a point at (10.5, 15.5, 0.1), this point should not be clipped out. but it did clip it out.

this issue doesn't happen in non-DRI mode.