Az az ati driverhez adott belso agpgart-ot kapcsolja be. Ha nincs bent akkor is mennie kell a kernel-hez adottal. Alapbol egyebkent bent van meg ha hianyzik is az xorg.conf-bol. :-)
http://gentoo-wiki.com/HOWTO_ATI_Drivers
By default, the driver uses the Internal AGPGART. Sometimes the internal one doesn't work, and you will have to use the one provided with the kernel. Search your xorg.conf for the line that has the option "UseInternalAGPGART." Simply change the "yes" to "no."
If you can't find it, add it. In the Section "Device" right under Driver "fglrx"
Option "UseInternalAGPGART" "no"
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Minnél korszakalkotóbb ötlettel állsz elő, annál több hülyén kell átverekedned magadat.