installation of nvidia legacy 340 driver fails on upgrade to 21.05

[jkozak]

Describe the bug

I am trying to upgrade nixos to 21.05. I have an antique nvidia card which requires the legacy 340 drivers and I have set up configuration.nix so:

  # Enable the X11 windowing system.
  services.xserver.enable = true;
  services.xserver.videoDrivers = [ "nvidia" ];
  hardware.nvidia.package = config.boot.kernelPackages.nvidiaPackages.legacy_340;
  services.xserver.layout = "gb";

when I do nixos-rebuild --upgrade switch it fails so (on multiple files):

In file included from /build/kernel/nv-acpi.c:15:
/build/kernel/nv-linux.h: At top level:
/build/kernel/nv-linux.h:139:10: fatal error: linux/ioctl32.h: No such file or directory
  139 | #include <linux/ioctl32.h>          /* register_ioctl32_conversion()    */
      |          ^~~~~~~~~~~~~~~~~
compilation terminated.

nix-env --version output

nix-env (Nix) 2.3.11

nixos-rebuild.log

[bjornfor]

NixOS 21.05 upgraded the default Linux kernel version. Perhaps you can get it working by selecting an older kernel version?

[jkozak]

It builds on kernel 5.4 - thanks!

[Ericson2314]

Wrong repo?

[RinatKurmaev]

It builds on kernel 5.4 - thanks!

How did you manage to do that. Can you provide the example of your configuration?

[vcunat]

@RinatKurmaev: that's basic NixOS config

boot.kernelPackages = pkgs.linuxPackages_5_4;