Success! I have managed to get everything working, and working quite
well. The ATI driver will freak-out if you switch display modes or
restart the X server while UNDER-clocking, but other than that I have
the display drivers working just fine.

The problem was primarily with Slackware 11 running Xorg 6.9. For some
reason, the ATI drivers do not want to work with the stock version of
Xorg 6.9, nor the "patched" version available from Slackware's ftp
servers. I found a pre-built Xorg 7.2 (thank God!) for Slackware 11,
and after a few bumps in the road upgrading, the ATI drivers work just
fine.

There are a couple of "gotchas". First, if you want hardware ATI's
kernel module working with 2.6.20 (NOT needed for general office use),
then you need to patch the source that the ATI driver package gives
you. http://www.thinkwiki.org/wiki/Problems_with_fglrx#fglrx_8.34.8

The second gotcha is that the ATI driver wont install right into an
Xorg 7.2 setup. You need to extract the package (hint, call the .bin
with --help), and then copy the 7.1 files into your 7.2 install. There
are also some files that you can only get from the 6.9 section of the
driver package, but they don't provide a lot of extra features. If you
snoop around enough in the extracted files, you'll find everything you
need. The aticonfig program isn't useful at all for generating an
xorg.conf, but it IS USEFUL for underclocking you GPU to save power
and reduce heat.

Hope this helps!

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