According to this: https://devtalk.nvidia.com/default/topic/691565/linux/geforce-driver-problem-on-centos-6-4-with-xen-installed/2/ They could have at least had the decency to list what the last driver that supprots Xen dom0 is or clarify whether they intend to fix the problem, and if so, when. Judging by the fact that they deleted my post asking the exact same question, I'm guessing they don't intend to fix it. The cynic in me thinks that keeping up with the anti-detection measures in recent QEMU and Xen has made it too difficult to distinguih between dom0 and domU, so rather than uncripple domU operation they dropped dom0 operation. Between breaking domU operation in the driver based on a device ID whitelist, issues like the above and drivers that are just plain broken (I wasted a day trying - unsuccessfully - to get GT630 cards to work in dom0 on my machine - my old 8800GT works fine, GT630 doesn't) I am seriously itching to jump ship to ATI at the earliest possible opportunity. I wanted to reduce power and noise on my virtualization machine and wanted a passively cooled dom0 card. Preferrred choice was a GT630, but the driver would randomly crash at startup. It'd boot and work fine maybe one boot in 10, and completely irreversibly crash the console (but not quite the whole machine, just unkillable Xorg lock-up) the other 9/10 of the time. So I'm voting with my feet - with a HD7450 in my dom0. Yes, it's slow, laggy and the tearing between multiple screens is much worse, but that's still a lot better than not working at all. And I still get to save 70W. Gordan