Support for the Dell XPS 13, 9300 model

dell/xps/13-9300/README.wiki

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+= Dell XPS 13 9300 =
+
+== Firmware upgrades ==
+
+Note that this device is supported by [https://fwupd.org/ fwupd].
+To perform firmware upgrades just activate the service
+
+<code>
+services.fwupd.enable = true;
+</code>
+
+Then use <code>fwupdmgr</code> to perform updates.
+
+== Battery drain when sleeping ==
+
+The laptop uses the S2 sleep mode by default instead of S3, which leads to
+draining a lot of battery during sleep.
+
+See https://wiki.archlinux.org/index.php/Dell_XPS_13_(9300)#Power_Management
+and https://bugzilla.kernel.org/show_bug.cgi?id=199689#c3 for reference

dell/xps/13-9300/default.nix

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+{ config, lib, ... }:
+
+let
+  inherit (lib) mkDefault;
+
+in {
+  imports = [
+    ../../../common/cpu/intel
+    ../../../common/gpu/intel.nix
+    ../../../common/pc/laptop
+    ../../../common/pc/laptop/acpi_call.nix
+    ../../../common/pc/ssd
+  ];
+
+  # Force S3 sleep mode. See README.wiki for details.
+  boot.kernelParams = [ "mem_sleep_default=deep" ];
+
+  # Touchpad goes over i2c, and the psmouse module interferes with it
+  boot.blacklistedKernelModules = [ "psmouse" ];
+
+  # Includes the Wi-Fi and Bluetooth firmware for the QCA6390.
+  hardware.enableRedistributableFirmware = mkDefault true;
+
+  # Allows for updating firmware via `fwupdmgr`.
+  services.fwupd.enable = mkDefault true;
+
+  # This will save you money and possibly your life!
+  services.thermald.enable = mkDefault true;
+}