I tried to use xenial, but the new driver was depending on a new xorg, which wasn't available.
I used deb http://ppa.launchpad.net/oibaf/graphics-drivers/ubuntu/
trusty main but it is empty. Every distribution below xenial seems to be empty.
Another idea would be to compile the packages on my own, but I am sure, I don't want to. If I compile a new driver, I may need a new Xorg. The new Xorg may need a new glib or a new compiler. The new compiler could be available in LTS with gcc-mozilla but in the end I have a linux from scratch.
If you have another idea, I can try it. If I have enough free time, I will install another distro.