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I have similar issues with the 24bit EXT_packed_depth_stencil format across multiple drivers, if i switch to the straight 32bit depth with no stencil it works fine. http://devgurus.amd.com/message/1286318#1286318
Im also finding the problems when reconstructing position from depth, all of these problems seem to be AMD related. When I run it on my nvidia 670 I dont get the problem, so there seems to be a problem with packed depth stencil formats.
The 24_8 format was promoted to core 3.0.