In case you're not using xfdesktop to draw your desktop background then this is the same bug, the root pixmap isn't painted correctly by nouveau. So if my assumption that you're not using xfdesktop is correct, it is xfwm4 drawing the root pixmap in your case. But it doesn't matter really, because the nouveau driver is still the culprit.
-- You received this bug notification because you are a member of Desktop Packages, 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 Status in LightDM GTK+ Greeter: Fix Released Status in “xserver-xorg-video-nouveau” package in Ubuntu: Confirmed Bug description: When I cold boot the login screen background is garbled - see screenshot attached ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu1 ProcVersionSignature: Ubuntu 3.13.0-1.16-generic 3.13.0-rc7 Uname: Linux 3.13.0-1-generic x86_64 ApportVersion: 2.12.7-0ubuntu6 Architecture: amd64 CurrentDesktop: XFCE Date: Fri Jan 10 08:21:28 2014 InstallationDate: Installed on 2013-12-25 (15 days ago) InstallationMedia: Xubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20131225) SourcePackage: xserver-xorg-video-nouveau UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/lightdm-gtk-greeter/+bug/1267742/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
