[ubuntu] Can't install the backported xorg to 12.04.2

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http://ubuntuforums.org – Hello, I found that quantat xorg stack is available in updates. I was using the xorg edgers ppa until now because I needed an updated driver for my laptop (intel 915 chipset). So I decided to purge the xorg edgers ppa and then install kernel and xorg from quantal using the ubuntu updates repository. I had no problem about the kernel but I'm struggling with the xorg stack. I tried to install xorg-xserver-lts-quantal package but ended with a broken X display. In fact ubuntu-desktop (and many other packages) is removed and I suppose this is my problem. So I would like to know if there a (Hardware)