The XFree86 ATI driver should be onboard. If you're running a stock Slackware install, X wasn't actually configured for you at all like the other distros, Patrick just includes a base, uber generic XF86Config file that should work with about 95% of the monitor/card combos out there on modern hardware.
backup your current /etc/X11/XF86Config file and then run:
X -configure
to create a new one. The output on the screen will tell you how to test it. To escape the test, ctrl+alt+backspace. If that looked good, copy it over to /etc/X11/XF86Config and edit in some resolution settings, like:
Code:
Monitor "Monitor0"
DefaultDepth 24
SubSection "Display"
Depth 1
EndSubSection
SubSection "Display"
Depth 4
EndSubSection
SubSection "Display"
Depth 8
EndSubSection
SubSection "Display"
Depth 15
EndSubSection
SubSection "Display"
Depth 16
EndSubSection
SubSection "Display"
Depth 24
Modes "1024x768"
ViewPort 0 0
EndSubSection
EndSection
Cheers,
Finegan