Blank display when exiting X, using NVidia blob

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https://bbs.archlinux.org – I'm using the proprietary NVidia drivers for my Macbook's 9400M graphics card, and while X can start, it seems to have trouble quitting. I can startx normally, but if I kill X or quit my window manager, the screen will go entirely blank. The system is not actually frozen, because if I issue a "reboot" command while in X, the screen will blank for just a moment (as opposed to showing the console, which it usually does) before rebooting normally. I've also tried to startx from the console, quit the WM, and blindly type "sudo reboot" and my password, after which (HowTos)