Comment # 8 on bug 64091 from Michel Dänzer

It's unlikely that both drivers are affected by one and the same problem. Let's
start looking at this from the r600g driver first and work our way up the stack
as necessary. :)

The r600g driver has been working around the issues pointed out by Alex using
GPU byte-swapping facilities, but that obviously isn't working for
depth/stencil readback.