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1 change: 1 addition & 0 deletions README.md
Original file line number Diff line number Diff line change
Expand Up @@ -160,6 +160,7 @@ See code for all available configurations.
| [Dell Precision 5490](dell/precision/5490) | `<nixos-hardware/dell/precision/5490>` | `dell-precision-5490` |
| [Dell Precision 5530](dell/precision/5530) | `<nixos-hardware/dell/precision/5530>` | `dell-precision-5530` |
| [Dell Precision 7520](dell/precision/7520) | `<nixos-hardware/dell/precision/7520>` | `dell-precision-7520` |
| [Dell Pro 14 PA14250](dell/dell-pro/PA14250) | `<nixos-hardware/dell/dell-pro/PA14250>` | `dell-pro-14-PA14250` |
| [Dell XPS 13 7390](dell/xps/13-7390) | `<nixos-hardware/dell/xps/13-7390>` | `dell-xps-13-7390` |
| [Dell XPS 13 9300](dell/xps/13-9300) | `<nixos-hardware/dell/xps/13-9300>` | `dell-xps-13-9300` |
| [Dell XPS 13 9310](dell/xps/13-9310) | `<nixos-hardware/dell/xps/13-9310>` | `dell-xps-13-9310` |
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60 changes: 60 additions & 0 deletions dell/dell-pro/PA14250/default.nix
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@@ -0,0 +1,60 @@
{ lib, ... }:

# Xe module fails to load on 6.12.x starting 6.12.35
# tested to work on 6.13.4 or newer
#
# Bisect points at d42b44736ea29fa6d0c3cb9c75569314134b7732 but
# 6.13 series 30d105577a3319094f8ae5ff1ceea670f1931487 looks identical
# so it has to be not just that commit but its interactions with 6.12
# driver version
#
# https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/5373
let
brokenXeModule = version: lib.versionAtLeast version "6.12.35" && lib.versionOlder version "6.13.4";
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6.12 fix is on the way https://lore.kernel.org/stable/[email protected]/T/#t once a new version is available I'll update the condition here

in
{
imports = [
../../../common/cpu/intel/lunar-lake
../../../common/pc/laptop
../../../common/pc/ssd
];

hardware.intelgpu.driver = "xe";

boot = lib.mkMerge [
{
# use xe graphics module, i915 doesn't seem to work well
# just selecting xe seems to be not enough
blacklistedKernelModules = [ "i915" ];

kernelParams = [
# makes external display more stable
"xe.psr_safest_params=1"
# extra debug logs just in case something breaks
"xe.verbose_state_checks=true"
];
}

# we can't inspect config.boot.kernelPackages.kernel.version to override kernelPackages as it's create a loop
# instead let's auto-apply latest kernel if linux_default is broken
#
# TODO: this may unnecessarily bump kernel to latest if say 6.13 is manually selected in configuration
# maybe we need extra parameter to this module? Though should still already be possible to overrule module kernel selection.
# Looking at linux_default version is also less restrictive than always setting latest,
# once 6.12 is fixed we can update brokenXeModule expression and only do override on old nixpkgs versions that haven't yet
# upgraded to a fixed kernel
(lib.mkIf (brokenXeModule pkgs.linuxKernel.packageAliases.linux_default.kernel.version) {
kernelPackages = pkgs.linuxPackages_latest;
})
];

assertions = lib.optionals (config.hardware.intelgpu.driver == "xe") [
{
assertion = !(brokenXeModule config.boot.kernelPackages.kernel.version);
message = "xe driver would fail with 'probe with driver xe failed with error -110'";
}
];

# Recommended in NixOS/nixos-hardware#127
services.thermald.enable = lib.mkDefault true;
}
1 change: 1 addition & 0 deletions flake.nix
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Expand Up @@ -93,6 +93,7 @@
dell-precision-5530 = import ./dell/precision/5530;
dell-precision-5560 = import ./dell/precision/5560;
dell-precision-7520 = import ./dell/precision/7520;
dell-pro-14-PA14250 = import ./dell/dell-pro/PA14250;
dell-xps-13-7390 = import ./dell/xps/13-7390;
dell-xps-13-9300 = import ./dell/xps/13-9300;
dell-xps-13-9310 = import ./dell/xps/13-9310;
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