magnification in Ubuntu 15.10?

[Milton]

Hi List,

I did a fresh install of Ubuntu 15.10 to try magnification. I installed 
compizconfig-settings-manager and compiz-plugins. I notice that Enhanced 
Zoom Desktop is enabled by default. I changed some short cut keys for 
avoiding using the Suer key. In Unity and Metacity nothing happens with 
magnification while in Gnome-shell it works. But in Gnome-shell negative 
view is not working after I checked this function. Do you have some 
tips? Thanks.
Milton