@arun-ta: with "text nomodeset" (and without "spash"), it works with Ubuntu's kernel and without xorg's PPA. However lightdm seams not be able to start automatically anymore and I start it manually after text login.
@arun-ta: with "text nomodeset" (and without "spash"), it works with Ubuntu's kernel and without xorg's PPA. However lightdm seams not be able to start automatically anymore and I start it manually after text login.