However, You can force unity into "Low Graphics Mode" with the following command:
echo "export UNITY_LOW_GFX_MODE=1" | sudo tee /etc/X11/Xsession.d/99force-llvmThis disables the dash transparency and blur completely. The only problems I saw with this mode was that the alt tab switcher is still transparent and now doesn't have blur so it can be a little less readable, however I didn't find it nearly as bad as the dash's readability when blur was disabled/transparency enabled and I found it to still be usable.
This command may look like you are forcing your machine to use "software rendering", but that does not seem to be the case in my testing, it just disables the effects while letting you retain hardware acceleration. glxinfo says that I am still using the intel driver and renderer:
GL_RENDERER = Mesa DRI Intel(R) Ironlake Mobile
If LLVM software rendering were being used it would look like this:
GL_RENDERER = Gallium 0.4 on llvmpipe (LLVM 3.1)
should work on 12.10 and 13.04