Created attachment 369042 [details] /var/log/Xorg.0.log.old On fully-updated F12 beta x86_64 system, browsing to the web site: http://scathinglywrongrightwingnutz.blogspot.com/2009/10/difference-between-propaganda-and-facts.html *then* scrolling down twice crashes my X session. (Scrolling down is required for the crash, just letting the site sit there in Firefox appears to be fine.) The crash kills my GNOME session, and kicks me back to GDM. This is entirely reproducible.
Created attachment 369044 [details] Output of "lsmod".
Created attachment 369045 [details] Output of "lspci -v".
This does not look the same as either 534142 or 533645, Robert, despite your mailing list post. 534142 is with KMS disabled (you didn't say you've done that) and it's a somewhat different backtrace. 533645 isn't an X crash at all.
Based on a suggestion on the Fedora test list, I added: Option "AccelMethod" "XAA" to my xorg.conf, and that seems to have solved the problem. My full xorg.conf listing: Section "ServerFlags" Option "DontZap" "false" EndSection Section "Device" Identifier "Videocard0" Driver "radeon" Option "AccelMethod" "XAA" EndSection Since adding that line, I've yet to have an X crash.
Robert you have issue with KMS? (Sorry if i ask twice but sadly there is enough bugs for me to forget about such thing).
This bug appears to have been reported against 'rawhide' during the Fedora 12 development cycle. Changing version to '12'. More information and reason for this action is here: http://fedoraproject.org/wiki/BugZappers/HouseKeeping
*** This bug has been marked as a duplicate of bug 533973 ***