ati abandoned this video card around 2004-5
there is no driver for it anymore, the free fgrlx driver that xorg offers is all what you have now
what monitor do you have?
you have to choose it properly so the resolutions in pclinux control center are selected properly
i don't know what resolution can have that thinkpad but if it is old and 4:3 this is the maximum possibly
the driver that you should be using now is x950 and earlier, be sure to enable transparency and 3d in pclinux control center/hardware/configure graphics card/
in there you can set the driver i mentioned for video card and also the monitor you have, be sure to select one with the same resolution you know that thinkpad can give