Have you installed the ATI drivers? You can find them either in the livna http://rpm.livna.org or in http://ati.amd.com/support/driver.html
I am not sure if the feature you are requiring works properly for the ATI cards in Linux. I know the XGL required to use Beryl don't work.
Joe.
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Notebook: Acer Aspire 5536-5112.
AMD Athlon X2 QL64 @ 2.1GHz, 4GB DDR2 PC2-5300, ATI Radeon HD3200 (256MB), 250GB Toshiba HDD, HL-DT-ST DVDRAM GT20N
Fedora 16 x86_64
Netbook: Acer Aspire One A150
Intel Atom N270 @ 1.6GHz, 1.5 GB DDR2 PC2-4200, Intel Graphics (8MB?), 160GB Seagate HDD
Fedora 15 i686
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