Comment 37 for bug 650539

Nomad42184 asked if the Xinerama problem is being "explored upstream"?

Bug 6450599 https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers/+bug/650599

I reported be experience with nVidia. They confirm the bug, but says it's an Ubuntu-only problem and closed the bug report.

They claim that Arch-linux doesn't have the same issue.

My advice is to pester nVidia.
http://nvidia.custhelp.com/cgi-bin/nvidia.cfg/php/enduser/std_adp.php?p_faqid=44

I don't think they realise what a big deal this issue is.