Black screen freeze when shutting down X or changing to console
I am randomly getting a black screen and system freeze when I shut down X or switch to a text terminal session (ctrl+alt+F1). It doesn't happen all the time, only randomly. The system completely freezes - can't ssh in, num/caps/scroll lock don't work. The system is connected to a TV via svideo cable, without a computer monitor. The card is an FX5600 running with driver version 1.0-9746. It is a FC6 system with kernel 2.6.19-1.2911.fc6.
I am unable to run nvidia-bug-report after the crash, so the attached file is just after starting X. The xorg log file shows X starting up, and then the system is switched between console and X repeatedly (ctrl+alt+F1, crt+alt+F7,...) until it freezes.
I am happy to provide more information if necessary.