That's a good start, you could also try older versions of xserver-xorg-video-nv and xserver-xorg-core and see if it broke in a specific upgrade. You can find older packages here, http://snapshot.debian.net/ Otherwise, I suggest you use the reportbug tool to file a bug report for xserver-xorg-video-nv.
I went to experimental and I found something. aptitude install xserver-xorg-video-nv/experimental xserver-xorg-core/experimental libdrm2/experimental xfonts-scalable It has to do with "Cannot read V_BIOS (3)". It seems that it happens with a lot of people when they have a secondary video card in some boards. There's a weird solution (at least weird to me :)) that involves extracting a ROM for the video card and placing it in a file that Xorg will use for this card. https://bugs.freedesktop.org/show_bug.cgi?id=2597#c36 I don't have such rom in my /sys filesystem. But still I'm trying. Regards, Nelson.- -- http://arhuaco.org http://emQbit.com