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This guide is about setting up NixOS to correctly use your Amd Graphics card if it is relatively new (aka, after the GCN architecture).
This guide is about setting up NixOS to correctly use your AMD Graphics card if it is relatively new (aka, after the GCN architecture).


== Make the kernel use the correct driver early ==
== Basic Setup ==
For ordinary desktop / gaming usage, AMD GPUs are expected to work out of the box. As with any desktop configuration though, graphics acceleration does need to be enabled.
<syntaxhighlight lang="nix">
hardware.graphics = {
  enable = true;
  enable32Bit = true;
};
</syntaxhighlight>
 
== Problems ==
 
=== Dual Monitors ===
 
If you encounter problems having multiple monitors connected to your GPU, adding `video` parameters for each connector to the kernel command line sometimes helps.
 
For example:
 
<syntaxhighlight lang="nix">
boot.kernelParams = [
  "video=DP-1:2560x1440@144"
  "video=DP-2:2560x1440@144"
];
</syntaxhighlight>
 
With the connector names (like `DP-1`), the resolution and frame rate adjusted accordingly.
 
To figure out the connector names, execute the following command while your monitors are connected:
 
<syntaxhighlight lang="bash">
head /sys/class/drm/*/status
</syntaxhighlight>
 
=== System Hang with Vega Graphics (and select GPUs) ===
 
Currently on the latest kernel/mesa (currently 6.13 and 24.3.4 respectively), Vega integrated graphics (and other GPUs like the RX 6600<ref>https://bbs.archlinux.org/viewtopic.php?pid=2224147#p2224147</ref>) will have a possibility to hang due to context-switching between Graphics and Compute.<ref>https://bbs.archlinux.org/viewtopic.php?id=301798</ref> There are currently two sets of patches to choose between stability or speed that can be applied: [https://github.com/SeryogaBrigada/linux/commits/v6.13-amdgpu amdgpu-stable] and [https://github.com/SeryogaBrigada/linux/commits/v6.13-amdgpu-testing amdgpu-testing].
 
See [[Linux Kernel#Patching a single In-tree kernel module]], keep in mind how to make [https://stackoverflow.com/a/23525893 patch diffs from commits from GitHub], and consider this example configuration:<syntaxhighlight lang="nix">
{ config, pkgs, ... }:
let
  amdgpu-kernel-module = pkgs.callPackage ./packages/amdgpu-kernel-module.nix {
    # Make sure the module targets the same kernel as your system is using.
    kernel = config.boot.kernelPackages.kernel;
  };
  # linuxPackages_latest 6.13 (or linuxPackages_zen 6.13)
  amdgpu-stability-patch = pkgs.fetchpatch {
    name = "amdgpu-stability-patch";
    url = "https://github.com/torvalds/linux/compare/ffd294d346d185b70e28b1a28abe367bbfe53c04...SeryogaBrigada:linux:4c55a12d64d769f925ef049dd6a92166f7841453.diff";
    hash = "sha256-q/gWUPmKHFBHp7V15BW4ixfUn1kaeJhgDs0okeOGG9c=";
  };
  /*
  # linuxPackages_zen 6.12
  amdgpu-stability-patch = pkgs.fetchpatch {
    name = "amdgpu-stability-patch-zen";
    url = "https://github.com/zen-kernel/zen-kernel/compare/fd00d197bb0a82b25e28d26d4937f917969012aa...WhiteHusky:zen-kernel:f4c32ca166ad55d7e2bbf9adf121113500f3b42b.diff";
    hash = "sha256-bMT5OqBCyILwspWJyZk0j0c8gbxtcsEI53cQMbhbkL8=";
  };
  */
in
{
  # amdgpu instability with context switching between compute and graphics
  # https://bbs.archlinux.org/viewtopic.php?id=301798
  # side-effects: plymouth fails to show at boot, but does not interfere with booting
  boot.extraModulePackages = [
    (amdgpu-kernel-module.overrideAttrs (_: {
      patches = [
        amdgpu-stability-patch
      ];
    }))
  ];
}
</syntaxhighlight>
 
=== Sporadic Crashes ===
 
If getting error messages in <code>dmesg</code> with <code>page fault</code> or <code>GCVM_L2_PROTECTION_FAULT_STATUS</code> it might be from AMD GPU boosting too high without enough voltage
 
Use a tool like LACT to increase power usage limit to 15%, undervolt by moderate amount (e.g. -50mV for 7900 XTX) and optionally decrease maximum GPU clock.
 
* https://wiki.gentoo.org/wiki/AMDGPU#Frequent_and_Sporadic_Crashes
* https://gitlab.freedesktop.org/mesa/mesa/-/issues/11532
* https://gitlab.freedesktop.org/drm/amd/-/issues/3067
 
 
== Special Configuration ==
The following configurations are only required if you have a specific reason for needing them. They are not expected to be necessary for a typical desktop / gaming setup.
 
=== Enable Southern Islands (SI) and Sea Islands (CIK) support ===
The oldest architectures that AMDGPU supports are [[wikipedia:Radeon_HD_7000_series|Southern Islands (SI, i.e. GCN 1)]] and [[wikipedia:Radeon_HD_8000_series|Sea Islands (CIK, i.e. GCN 2)]], but support for them is disabled by default. To use AMDGPU instead of the <code>radeon</code> driver, you can set the kernel parameters:
 
<syntaxhighlight lang="nix">
# For Southern Islands (SI i.e. GCN 1) cards
boot.kernelParams = [ "radeon.si_support=0" "amdgpu.si_support=1" ];
# For Sea Islands (CIK i.e. GCN 2) cards
boot.kernelParams = [ "radeon.cik_support=0" "amdgpu.cik_support=1" ];
</syntaxhighlight>
 
Doing this is required to use [[#Vulkan|Vulkan]] on these cards, as the <code>radeon</code> driver doesn't support it.
 
=== HIP ===
Most software has the HIP libraries hard-coded. You can work around it on NixOS by using:
 
<syntaxhighlight lang="nix">
  systemd.tmpfiles.rules =
  let
    rocmEnv = pkgs.symlinkJoin {
      name = "rocm-combined";
      paths = with pkgs.rocmPackages; [
        rocblas
        hipblas
        clr
      ];
    };
  in [
    "L+    /opt/rocm  -    -    -    -    ${rocmEnv}"
  ];
 
</syntaxhighlight>
 
==== Blender ====
Hardware accelerated rendering can be achieved by using the package <syntaxhighlight lang="nix" inline="">blender-hip</syntaxhighlight>.


The kernel can load the correct driver right away (in hardware-configuration.nix):
Currently, you need to [[Linux kernel|use the latest kernel]] for <syntaxhighlight lang="nix" inline="">blender-hip</syntaxhighlight> to work.


=== OpenCL ===
<syntaxhighlight lang="nix">
<syntaxhighlight lang="nix">
boot.initrd.kernelModules = [ "amdgpu" ];
hardware.graphics.extraPackages = with pkgs; [ rocmPackages.clr.icd ];
</syntaxhighlight>
</syntaxhighlight>


== XServer ==
You should also install the <code>clinfo</code> package to verify that OpenCL is correctly setup (or check in the program you use to see if it is now available, such as in Darktable).


Make sure Xserver uses the `amdgpu` driver in your configuration.nix:
==== Radeon 500 series (aka Polaris) ====
As of [https://github.com/ROCm/ROCm/issues/1659 ROCm 4.5], AMD has disabled OpenCL on Polaris-based cards. This can be re-enabled by setting the environment variable <code>ROC_ENABLE_PRE_VEGA=1</code>


<syntaxhighlight lang="nix">
<syntaxhighlight lang="nix">
services.xserver.enable = true;
environment.variables = {
services.xserver.videoDrivers = [ "amdgpu" ];
  ROC_ENABLE_PRE_VEGA = "1";
};
</syntaxhighlight>
</syntaxhighlight>


==== Older GPUs (TeraScale) ====


== OpenCL ==
<!-- FIXME this should be moved to a dedicated page for the "radeon" driver or OpenCL, if either of those are created at some point in the future -->


From 20.09, add this to your hardware-configuration.nix:
For graphics cards older than GCN 1 — or for any GCN using the "radeon" driver — enable OpenCL by adding Clover ''instead of'' the ROCm ICD:


<syntaxhighlight lang="nix">
<syntaxhighlight lang="nix">
hardware.opengl.extraPackages = with pkgs; [
hardware.opengl.extraPackages = with pkgs; [
  rocm-opencl-icd
  # OpenCL support for the older Radeon R300, R400, R500,
  rocm-opencl-runtime
  # R600, R700, Evergreen, Northern Islands,
  # Southern Islands (radeon), and Sea Islands (radeon)
  # GPU families
  mesa.opencl
  # NOTE: at some point GPUs in the R600 family and newer
  # may need to replace this with the "rusticl" ICD;
  # and GPUs in the R500-family and older may need to
  # pin the package version or backport Clover
  # - https://www.phoronix.com/news/Mesa-Delete-Clover-Discussion
  # - https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19385
];
];
</syntaxhighlight>
</syntaxhighlight>


You should also install the clinfo package to verify that Open CL is correctly setup (or check in the program you use to see if it is now available, such as in Darktable).
Merely installing <code>mesa.opencl</code> with <code>nix-shell -p</code> will not work; it needs to be present at build-time for the OpenCL ICD loader, which only searches static paths.


== Vulkan ==
=== Vulkan ===
Vulkan is already enabled by default (using Mesa RADV) on 64 bit applications. The settings to control it are:


To enable vulkan
<syntaxhighlight lang="nix">
<syntaxhighlight lang="nix">
hardware.opengl.driSupport = true;
hardware.opengl.driSupport = true; # This is already enabled by default
# For 32 bit applications
hardware.opengl.driSupport32Bit = true; # For 32 bit applications
hardware.opengl.driSupport32Bit = true;
</syntaxhighlight>
</syntaxhighlight>


==== AMDVLK ====
The AMDVLK drivers can be used in addition to the Mesa RADV drivers. The program will choose which one to use:


{{Note|amdvlk is not needed for vulkan}}
<syntaxhighlight lang="nix">
Starting from 20.09, the amdvlk drivers can be used in addition to the mesa radv drivers, the program will choose which one to use:
#24.11
hardware.graphics.extraPackages = with pkgs; [
  amdvlk
];
# For 32 bit applications
hardware.graphics.extraPackages32 = with pkgs; [
  driversi686Linux.amdvlk
];


<syntaxhighlight lang="nix">
#24.05 and below
hardware.opengl.extraPackages = with pkgs; [
hardware.opengl.extraPackages = with pkgs; [
  amdvlk
  amdvlk
];
];
# For 32 bit applications  
# For 32 bit applications  
# Only available on unstable
hardware.opengl.extraPackages32 = with pkgs; [
hardware.opengl.extraPackages32 = with pkgs; [
   driversi686Linux.amdvlk
   driversi686Linux.amdvlk
];
];
</syntaxhighlight>
</syntaxhighlight>
more information can be found here https://nixos.org/manual/nixos/unstable/index.html#sec-gpu-accel-vulkan
 
More information can be found here: https://nixos.org/manual/nixos/unstable/index.html#sec-gpu-accel-vulkan
 
===== Performance Issues with AMDVLK =====
Some games choose AMDVLK over RADV, which can cause noticeable performance issues (e.g. <50% less FPS in games)
 
To force RADV<syntaxhighlight lang="nix">
environment.variables.AMD_VULKAN_ICD = "RADV";
</syntaxhighlight>
 
=== GUI tools ===
 
==== LACT - Linux AMDGPU Controller ====
 
This application allows you to overclock, undervolt, set fans curves of AMD GPUs on a Linux system.
 
In order to install the daemon service you need to add the package to <code>systemd.packages</code>. Also the <code>wantedBy</code> field should be set to <code>multi-user.target</code> to start the service during boot.
 
<syntaxhighlight lang="nix">
environment.systemPackages = with pkgs; [ lact ];
systemd.packages = with pkgs; [ lact ];
systemd.services.lactd.wantedBy = ["multi-user.target"];
</syntaxhighlight>
 
=== Links ===
 
* https://wiki.archlinux.org/title/AMDGPU
* https://wiki.gentoo.org/wiki/AMDGPU
 
=== References ===


[[Category:Video]]
[[Category:Video]]
Retrieved from "https://wiki.nixos.org/wiki/AMD_GPU"