Comment 3 for bug 138742

Thanks for your report. Actually this is not new bug. Fastwrites have always been unstable and is not recommended nor supported by the driver developers. In some previous versions of the ati driver the fastwrites were disabled unconditionally, even if they were turned on in xorg.conf and reported to be on in Xorg.0.log. Now, they are just defaulted to off, but will be turned on if the user insists.