Total system lockup? As in the drivers went to Mars? What version of the nvidia driver are you using? If you just mean myth locked up, then ignore the stuff about SysRq and debug kernels below.
In my case, the entire system locks up. I've had this with 7174 and 6629. Any SSH sessions I had into the mythtv machine from my windows machine are frozen. Ctrl-Alt-Del or Ctrl-Alt-Backspace does nothing. It looks like a hard lock-up. The keyboard lights are *not* flashing, and the screen is displaying a still frame of the video.
Do you think the SysRq thing might help in my case?
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