Comment 94 for bug 653714

On Lubuntu 14.04.3 (I think it's Kernel 3.19.x) "nouveau.agpmode=0" also works, although standby still doesn't seem to work.
What I want to note though, is, that activating the Shadow Framebuffer in /etc/X11/xorg.conf.d/20-nouveau.conf results in a substantial performance increase regarding scrolling and so on.
Maybe this should be considered for the nv28m-cards.