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My NixOS systems configurations.
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dell-latitude-e6540.nix (644B)

      1 { config, pkgs, ... }:
      2 
      3 {
      4   boot = {
      5     loader.efi.canTouchEfiVariables = true;
      6     kernelParams = [
      7       # Kernel GPU Savings Options (NOTE i915 chipset only)
      8       "i915.enable_rc6=0"
      9       "i915.enable_fbc=1"
     10       "i915.lvds_use_ssc=0"
     11       "drm.debug=0"
     12       "drm.vblankoffdelay=1"
     13     ];
     14     blacklistedKernelModules = [
     15       # Kernel GPU Savings Options (NOTE i915 chipset only)
     16       "sierra_net"
     17       "cdc_mbim"
     18       "cdc_ncm"
     19     ];
     20   };
     21   hardware = {
     22     opengl = {
     23       enable = true;
     24       extraPackages = [ pkgs.vaapiIntel ];
     25       driSupport32Bit = true;
     26     };
     27   };
     28   nix.maxJobs = 8;
     29   services.acpid.enable = true;
     30 }