nvidia is currently partially incompatible with linux >= 5.9 [1][2]. While graphics should work fine, CUDA and OpenCL are broken. Users who've already upgraded and need those features are advised to switch to the linux-lts kernel for the time being.
[1] https://forums.developer.nvidia.com/t/nvidia-driver-not-yet-supported-for-linux-kernel-5-9/157263 [2] https://bugs.archlinux.org/task/68312
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