Adding an xorg.conf with Option "DebugFlushBatches" "True" as described in the linked bug makes things much better.
** Bug watch added: freedesktop.org Bugzilla #35808 http://bugs.freedesktop.org/show_bug.cgi?id=35808 ** Also affects: xorg-server via http://bugs.freedesktop.org/show_bug.cgi?id=35808 Importance: Unknown Status: Unknown -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/750964 Title: Screen corruption in menus and titlebars _______________________________________________ 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
