[Bug] plymouth theme animation broken when using linuxPackages_cachyos* kernels

[qweered]

What happens?

Animation is displayed only in last second on boot, it is static otherwise

What is expected to happen?

Animation displayed during all boot

If possible, please attach logs

N/A

More information

I am using this config for plymouth:

plymouth = {
      enable = true;
      theme = "nixos-bgrt";
      themePackages = [ pkgs.nixos-bgrt-plymouth ];
};

[qweered]

Full config for boot:

{ pkgs, ... }:

{
  security.unprivilegedUsernsClone = true; # Required for hardened kernel
  services.scx.enable = true;
  # TODO: enably cachy ananicy rules

  boot = {
    loader.systemd-boot.enable = true;
    loader.efi.canTouchEfiVariables = true;
    tmp.cleanOnBoot = true;
    # initrd.systemd.enable = true; # TODO: Not feature-complete yet https://blog.decent.id/post/nixos-systemd-initrd/

    kernelPackages = pkgs.linuxPackages_cachyos; # TODO: evaluate switching to hardened when using nix-mineral

    plymouth = {
      enable = true;
      theme = "nixos-bgrt";
      # TODO: replace with my own theme
      themePackages = [ pkgs.nixos-bgrt-plymouth ];
    };

    # Silent boot
    initrd.verbose = false;
    consoleLogLevel = 0;
    # TODO: configure more parameters
    kernelParams = [
      "quiet"
      "splash"
      "vt.global_cursor_default=0"
      "loglevel=3"
      "rd.systemd.show_status=auto"
      "rd.udev.log_level=3"
      "udev.log_priority=3"

      "boot.shell_on_fail"
    ];

    # Hide the OS choice for bootloaders.
    # It's still possible to open the bootloader list by pressing any key
    # It will just not appear on screen unless a key is pressed
    loader.timeout = 0;
  };
}

[PedroHLC]

Just to be sure: does it work with kernelPackages = pkgs.linuxPackages_6_12;?

[qweered]

I tested with linuxPackages_latest today on unstable nixpkgs, surely works

[qweered]

Same correct behavior with pkgs.linuxPackages_6_12

[s0me1newithhand7s]

haven't stumble across this problem:

╭──╼ s0mePC-nix on NixOS 25.5.0 ❄️  
┆ ~ 
╰─> uname -a                                                                                                                                                                                ✓  at ❗ 00:13
Linux s0mePC-nix 6.12.6-cachyos #1-NixOS SMP PREEMPT_DYNAMIC Thu Dec 19 17:13:24 UTC 2024 x86_64 GNU/Linux

&

[qweered]

@s0me1newithhand7s you didn't select theme

theme = "nixos-bgrt";

[s0me1newithhand7s]

@s0me1newithhand7s you didn't select theme

theme = "nixos-bgrt";

isn't "nixos-bgrt" and "nixos-bgrt-plymouth" are same? anyway - i'll try

[qweered]

Still the same issue on latest everything, can debug it if anyoune told me how. Current boot config:

{ pkgs, inputs, ... }:

{
  services.scx.enable = true;

  boot = {
    loader.systemd-boot.enable = true;
    loader.efi.canTouchEfiVariables = true;
    tmp.cleanOnBoot = true;

    kernelPackages = pkgs.linuxPackages_cachyos;

    plymouth = {
      enable = true;
      theme = "nixos-bgrt";
      themePackages = [ pkgs.nixos-bgrt-plymouth ];
    };

    # Silent boot
    initrd.verbose = false;
    consoleLogLevel = 0;
    kernelParams = [
      "quiet"
      "splash"
      "vt.global_cursor_default=0"
      "loglevel=3"
      "rd.systemd.show_status=auto"
      "rd.udev.log_level=3"
      "udev.log_priority=3"

      "boot.shell_on_fail"
      "microcode.amd_sha_check=off" # for ucodenix to work properly
    ];
    loader.timeout = 0;
  };
}

[PedroHLC]

Which kernel configs are required for Plymouth?

Do you guys have some error in dmesg?

[qweered]

Which kernel configs are required for Plymouth?

just

    plymouth = {
      enable = true;
      theme = "nixos-bgrt";
      themePackages = [ pkgs.nixos-bgrt-plymouth ];
    };

Do you guys have some error in dmesg?

[ 2.872619] systemd[1]: Dispatch Password Requests to Console Directory Watch was skipped because of an unmet condition check (ConditionPathExists=!/run/plymouth/pid). [ 2.872712] systemd[1]: Started Forward Password Requests to Plymouth Directory Watch.

Nothing else related

[depeo]

Hi, same issue here, changing kernelPackages = pkgs.linuxPackages_cachyos to kernelPackages = pkgs.linuxPackages_zen makes it work without any other changes.

[qweered]

When switching to cachyOs kernel from latest i see this:

Version changes: [U.] #1 initrd-linux 6.15 -> 6.15.0 [U.] #2 linux 6.15, 6.15-modules, 6.15-modules-shrunk -> 6.15.0, 6.15.0-modules, 6.15.0-modules-shrunk Added packages: [A.] #1 unit-systemd-tmpfiles-setup-sysroot.service Removed packages: [R.] #1 plymouth-initrd-plugins [R.] #2 unit-initrd-switch-root.service

[PedroHLC]

Oh, then it's something in Nixpkgs' nixosModules. Probably asserting some kernel version/passthru that I missed.

[PedroHLC]

I wrote a test VM, and it works perfectly:

cd /tmp
nix build -L github:chaotic-cx/nyx#linux_cachyos.passthru.tests.plymouth.driverInteractive \
  && result/bin/nixos-test-driver

[PedroHLC]

The only thing out-of-ordinary here, is that the virtualisation stuff adds a console=tty0, and so I needed this line: https://github.com/chaotic-cx/nyx/blob/1109c2cfdd262417b4d8148aa3cc1228679d9270/pkgs/linux-cachyos/test.nix#L61

[PedroHLC]

I'm now daily driving Plymouth without issues (except a resolution change after systemd-boot, and stage-2 making it disappear).

If someone can reproduce the issue originally described here (by editing pkgs/linux-cachyos/test.nix), please re-open and post the diff.