Comment 48 for bug 220345

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Barry Brickell (barry-brickell) wrote : Re: [hardy] kernel 2.6.24-16-generic + radeon driver = system freezes

Try upping your AGP aperture size.

I had which looked like the same issue with a Radeon X800 GTO. I reset the BIOS before I rebuilt the box, so the AGP aperture size was set to 64M. Upping it to 128M seems to have fixed it. I've managed to recreate the issue several times.