The NVRM log messages stopped after reinstalling nvidia-331, but the system continued to use nouveau, and hence to crash (bug 1243557).
> modified.conffile..etc.modprobe.d.nvidia.331.hybrid.conf: [deleted]
I don't know how that (which blacklists nouveau) came to be missing, but purging and re-installing nvidia-331 put it back but didn't stop nouveau loading.
The NVRM log messages stopped after reinstalling nvidia-331, but the system continued to use nouveau, and hence to crash (bug 1243557).
> modified. conffile. .etc.modprobe. d.nvidia. 331.hybrid. conf: [deleted]
I don't know how that (which blacklists nouveau) came to be missing, but purging and re-installing nvidia-331 put it back but didn't stop nouveau loading.