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[catalyst-legacy] Black screen after Linux 3.9 upgrade

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linux-howto

http://chakra-project.org – I recommend to *always* do a full system backup before installing/upgrading such critical core parts; despite all the testing and the effort put to make the upgrade as smooth as possible every system is a whole different universe by it's own and things like this can -and in fact does- happen Same goes when upgrading to a new KDE version: be sure to backup your ~/.kde4 and other critical config files just in case...Now, my first move to restore your system would be to try to downgrade the upgraded packages. Please do check if you still have the old kernel and Catalyst packages in /var/cach (HowTos)