Pantelis Antoniou writes:

Count me in too; using a 970 in 32 bit mode, because of gentoo X.org
problems in 64 bit mode.

I'm using an X.org server on a ppc64 kernel, and it all works,
including DRI.  Both 32-bit and 64-bit X server and clients work.  We
now have the 32-bit ioctl compatibility sorted out in the kernel DRM.
So I don't think X is a reason to run a 32-bit kernel any more.

What X.org problems do you see with a 64-bit kernel?

Paul.