Hardware acceleration with Sapphire Radeon HD5450 on AMD64 Debian?

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http://unix.stackexchange.com – My Sapphire Radeon HD5450 graphics card works great with 2D graphics, but I can't seem to get hardware 3D acceleration working properly on an up-to-date Debian Squeeze running on the amd64 architecture. glxinfo reports: direct rendering: Yes server glx vendor string: SGI server glx version string: 1.2 ... client glx vendor string: Mesa Project and SGI client glx version string: 1.4 while lspci shows: 01:00.0 VGA compatible controller: ATI Technologies Inc Manhattan [Mobility Radeon HD 5430 Series] glxgears is totally smooth and reports close to 1000 fps in the default window size, dropp (HowTos)