Comment 19 for bug 767927

Yes, the revert script fixes the logout/shutdown freeze for me on the fglrx machine.

 http://www.kyleabaker.com/downloads/ubuntu/scripts/plymouth-resolution-fix-revert-back.sh.zip

I had forgotten that I had tinkered with the plymouth settings in 10.10 to get rid of an ugly bootsplash - self inflicted bug :)

I'll try in tomorrow on the nvidia machine that is showing similar symptoms.

I'll cross post to #762203.