Whatever window-manager you use, if you don't use a specific application like xfdesktop that paints the background in a separate window (i.e. not the root pixmap) you'll encounter this nouveau bug.
I haven't heard of a fix for this issue yet. -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-video-nouveau in Ubuntu. https://bugs.launchpad.net/bugs/1267742 Title: Screen artifacts appear after restart and cold boot To manage notifications about this bug go to: https://bugs.launchpad.net/lightdm-gtk-greeter/+bug/1267742/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : [email protected] Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp

