AMD GPU: Difference between revisions

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== 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 = {

~~# as of 24.11~~

hardware.graphics = {

enable = true;

enable32Bit = true;

};

};</syntaxhighlight>

~~# pre 24.11~~

~~hardware.opengl = {~~

~~enable = true;~~

~~driSupport = true;~~

~~driSupport32Bit = true;~~

};

</syntaxhighlight>

== Problems ==

Line 41:

Line 30:

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 ==

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=== Vulkan ===

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

Vulkan is already enabled by default (using Mesa RADV) on 64 bit applications. The settings to control it are now the same as those shown in the basic setup:

<syntaxhighlight lang="nix">hardware.graphics.enable = true;

hardware.~~opengl~~.~~driSupport~~ = true; ~~# This is already enabled by default~~

hardware.graphics.enable32Bit = true; # Replaced 'driSupport32Bit'

hardware.~~opengl~~.~~driSupport32Bit~~ = true; # ~~For 32 bit applications~~

</syntaxhighlight>

==== AMDVLK ====

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

{{Warning|1=AMDVLK is being discontinued, so the only reason you may want to use it is if you have issues with RADV. See: https://github.com/GPUOpen-Drivers/AMDVLK/discussions/416.}}

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

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More information can be found here: https://nixos.org/manual/nixos/unstable/index.html#sec-gpu-accel-vulkan

One way to avoid installing it system-wide, is creating a wrapper like this:

with pkgs; writeShellScriptBin "amdvlk-run" ''

export VK_DRIVER_FILES="${amdvlk}/share/vulkan/icd.d/amd_icd64.json:${pkgsi686Linux.amdvlk}/share/vulkan/icd.d/amd_icd32.json"

exec "$@"

'';

</syntaxhighlight>

This wrapper can be used per-game inside Steam (<syntaxhighlight lang="sh" inline>amdvlk-run %command%</syntaxhighlight>) and lets RADV to be the system's default.

===== 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.

environment.systemPackages = with pkgs; [ lact ];

systemd.packages = with pkgs; [ lact ];

systemd.services.lactd.wantedBy = ["multi-user.target"];

</syntaxhighlight>

</syntaxhighlight>Simple version is:<syntaxhighlight lang="nix">

services.lact.enable = true;

# https://github.com/NixOS/nixpkgs/blob/nixos-unstable/nixos/modules/services/hardware/lact.nix

</syntaxhighlight>

=== Links ===

* https://wiki.archlinux.org/title/AMDGPU

* https://wiki.gentoo.org/wiki/AMDGPU

=== References ===

[[Category:Video]]

@@ Line 3: / Line 3: @@
 == 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">
+<syntaxhighlight lang="nix">hardware.graphics = {
-# as of 24.11
-hardware.graphics = {
    enable = true;
    enable32Bit = true;
-};
+};</syntaxhighlight>
-# pre 24.11
-hardware.opengl = {
-  enable = true;
-  driSupport = true;
-  driSupport32Bit = true;
-};
-</syntaxhighlight>
 == Problems ==
@@ Line 41: / Line 30: @@
 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 ==
@@ Line 123: / Line 163: @@
 === Vulkan ===
-Vulkan is already enabled by default (using Mesa RADV) on 64 bit applications. The settings to control it are:
+Vulkan is already enabled by default (using Mesa RADV) on 64 bit applications. The settings to control it are now the same as those shown in the basic setup:
-<syntaxhighlight lang="nix">
+<syntaxhighlight lang="nix">hardware.graphics.enable = true;
-hardware.opengl.driSupport = true; # This is already enabled by default
+hardware.graphics.enable32Bit = true; # Replaced 'driSupport32Bit'
-hardware.opengl.driSupport32Bit = true; # For 32 bit applications
 </syntaxhighlight>
 ==== AMDVLK ====
-The AMDVLK drivers can be used in addition to the Mesa RADV drivers. The program will choose which one to use:
+{{Warning|1=AMDVLK is being discontinued, so the only reason you may want to use it is if you have issues with RADV. See: https://github.com/GPUOpen-Drivers/AMDVLK/discussions/416.}}
+The AMDVLK drivers can be used in addition to the Mesa RADV drivers. The program will choose which one to use (mostly defaulting to AMDVLK):
 <syntaxhighlight lang="nix">
@@ Line 154: / Line 196: @@
 More information can be found here: https://nixos.org/manual/nixos/unstable/index.html#sec-gpu-accel-vulkan
+One way to avoid installing it system-wide, is creating a wrapper like this:
+<syntaxhighlight lang="nix">
+with pkgs; writeShellScriptBin "amdvlk-run" ''
+  export VK_DRIVER_FILES="${amdvlk}/share/vulkan/icd.d/amd_icd64.json:${pkgsi686Linux.amdvlk}/share/vulkan/icd.d/amd_icd32.json"
+  exec "$@"
+'';
+</syntaxhighlight>
+This wrapper can be used per-game inside Steam (<syntaxhighlight lang="sh" inline>amdvlk-run %command%</syntaxhighlight>) and lets RADV to be the system's default.
+===== 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>
+</syntaxhighlight>Simple version is:<syntaxhighlight lang="nix">
+services.lact.enable = true;
+# https://github.com/NixOS/nixpkgs/blob/nixos-unstable/nixos/modules/services/hardware/lact.nix
+</syntaxhighlight>
+=== Links ===
+* https://wiki.archlinux.org/title/AMDGPU
+* https://wiki.gentoo.org/wiki/AMDGPU
+=== References ===
 [[Category:Video]]