Re: 1.0-9526 occasional few second freeze with freeciv
What you're experiencing is the driver detecting a specific class of errors and attempting to recover from them. This is a new feature in 1.0-9625 which was not present in the 1.0-8xxx (and earlier) drivers. This is why the problem is much worse for you in 1.0-8774.
The official FC kernels have AGP support compiled in, which is why you cannot use the nvidia driver's internal AGP support.
If you set NvAGP to 0, does that have any impact on the instability?