205
Fuck nvidia.
(mujico.org)
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Proprietary nvidia driver consists of (at least until recently) from two parts - closed userspace part and open kernel part. Those parts talk to each other with some protocol they change every once in a while and the only combination they support is that kernel module and userspace part must be of the same version. When they mismatch you still get video, you don't get acceleration. And reboot fixes the problem.
AKA bad engineering.