So far, I haven't checked the output of Xorg.0.log. Next time it locks up, I'll check that and file a bug with freedesktop with all my details. The two bugs you cite may be similar, but since I still get the lockup with 1.4.6.1, it's not quite the same.
-- -M There are 10 kinds of people in this world: Those who can count in binary and those who cannot. -- gentoo-user@gentoo.org mailing list