I managed to reproduce it now. It appeared when I switched between themes in gnome.
** Attachment added: "lspci -vvnn" http://launchpadlibrarian.net/40262803/lspci.txt -- wallpaper gets a white frame https://bugs.launchpad.net/bugs/513623 You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in ubuntu. _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp