Alerted by your posts, I just installed compiz on my T420 and on my Toshiba craptop
@mymy49: Although I do not know what the symptoms are that you are experiencing, compiz should work flawlessly on your computer. Did you actually try to install it ?
Since it works (albeit a bit slow) on my crappy 13 year old half-destroyed toshiba which has a E-350 APU with build in Radeon HD 6310, it will probably work on newer, faster and healthier AMD powered computers too, and probably much much better (like your T495).
If it doesn't work for you, try a fresh install because something in your settings is probably borked.
@Marco_Boneff: Compiz is in the repo and it seems to work....on both my portable pompeii called Toshiba C670D (AMD) and on my old Stinkpad T420 (Intel) it does.
How to install compiz:
sudo apt-get install compiz-mate compizconfig* compiz-plugins*
or use synaptic if you want a GUI