Custom kernel module ending up in the wrong place

[Atemu]

@generic-nixos-user

The resulting derivation just contains gslx680_ts_acpi.ko.

That’s wrong, it must be in the kernel-ABI specific lib dir for it to work with NixOS options.

What happens when you insmod that file?

@generic-nixos-user

I have tried to put it in /lib/<...>, but nothing changed

Are you sure you put it into the correct directory? It must be

$out/lib/modules/${kernel.modDirVersion}/updates/

i.e.

$out/lib/modules/6.6.34/updates/modulenamehere.ko.xz

@generic-nixos-user

How do the already packaged kernel modules deal with this?

Check the source. I.e. nixpkgs/pkgs/os-specific/linux/nct6687d/default.nix at 213b7c561bdd292f11ff99373222c2545c53ce7a · NixOS/nixpkgs · GitHub

How and where the module file is installed however is defined by the package’s build system however. That’s what you need to consult. You may need to set a specific installTarget like I had to in the module above.