Created attachment 329947 [details] xorg.log i work on not loaded machine, slow scrolling google reader news and its happens: check attachemnt
Thanks for the report. We are sorry that we cannot help you with your problem, but we are not able to support binary-only drivers. If you would be able to reproduce this issue using only open source software, please, reopen this bug with the additional information, but in meantime I have no choice than to close this bug as CANTFIX (because we really cannot fix it).