Are the ATI cards you've been using the absolute newest ones, or a couple of generations back? Also, are you using the closed-source or the open-source ATI dri

Are the ATI cards you've been using the absolute newest ones, or a couple of generations back? Also, are you using the closed-source or the open-source ATI drivers? And, are you using Ubuntu, or are you using some other distro? (My experience with non-LTS Ubuntu has been... substantially less than stellar over the past several years.)