nixos-hardware/lenovo/thinkpad/e14/amd/default.nix

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{ config, lib, pkgs, ... }:
{
imports = [
../.
../../../../common/cpu/amd
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../../../../common/gpu/amd
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];
boot.kernelParams = [
# With BIOS version 1.12 and the IOMMU enabled, the amdgpu driver
# either crashes or is not able to attach to the GPU depending on
# the kernel version. I've seen no issues with the IOMMU disabled.
#
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# BIOS version 1.13 fixes the IOMMU issues, but we leave the IOMMU
# in software mode to avoid a sad experience for those people that drew
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# the short straw when they bought their laptop.
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"iommu=soft"
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];
}