Interesting. I'm not normally in the habit of upgrading the kernel independently of the distribution, but it's worth trying. Thanks for the tip.

On earlier kernels, `acpi_osi="!Windows 2020"` was often recommended. Though I'm note sure what it does.

`nvme.noacpi=1` should be on, too, for all kernels.

(all derived from the nixos-hardware repo; I use that)

Thanks. I upgraded the kernel (had to turn off secure boot to do it), and set the nvme kernel option, too. So far no unwanted side-effects, but it's too soon to say if it fixed the problem.