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I just installed Fedora 15 Alpha (latest nightly) on an i7 Xeon system and got multiple AVC denials that prevented both graphical boot and even console logins. The only way to fix this was to add "1" to the boot params to boot in runlevel 1, then turn off selinux. (Even booting into runlevel 1 then typing "init 3" took away the ability to type further commands in the console.)
Created attachment 489530 [details] The AVC log
*** This bug has been marked as a duplicate of bug 692459 ***