[ubuntu] XPS17 monitor problem GT555M

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http://ubuntuforums.org – Hi everybody! I have a Dell XPS 17 64-bit with a nVidia GT555M. I installed Ubuntu 11.10 64-bit but I had to do it setting before installation NOMODESET. At that point, if I tried to run the system in normal mode, it just appeared a black screen. On the contrary, running it by recovery mode (resume normal) it runned fine. So I installed Bumblebee (i though it was a graphic card issue) following the procedure explained in http://askubuntu.com/questions/36930/how-well-do-laptops-with-nvidia-opt... Then I blacklisted the nouveau driver. So, this is the problem: running the sy (Hardware)