In 12.04, install 'gnome-panel', which will add the "Classic Gnome (no effects)" option. Boot into that and it'll give you a metacity window manager environment without compositing. You can verify that metacity compositing is off as so:
$ gconftool-2 -g '/apps/metacity/general/compositing_manager' false -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-video-intel in Ubuntu. https://bugs.launchpad.net/bugs/871972 Title: [i915] Screen display corruption resizing LibreOffice Calc window Acer Aspire 5750-9668 To manage notifications about this bug go to: https://bugs.launchpad.net/xserver-xorg-video-intel/+bug/871972/+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

