1 files changed, 31 insertions, 0 deletions
diff --git a/modules/nixos-hardware/lenovo/thinkpad/t490/default.nix b/modules/nixos-hardware/lenovo/thinkpad/t490/default.nix
new file mode 100644
index 000000000000..3578da66c73d
--- /dev/null
+++ b/modules/nixos-hardware/lenovo/thinkpad/t490/default.nix
@@ -0,0 +1,31 @@
+{ nixos, lib, pkgs, config, stdenv, ... }:
+{
+  imports = [
+    ../../../common/cpu/intel
+    ../../../common/pc/laptop/acpi_call.nix
+    ../.
+  ];
+
+  services = {
+    # This fixes the pulseaudio profiles of the Thinkpad T490.
+    # The laptop contains a single audio card with 5 sub-devices. Default pulseaudio only offers a single sink
+    # which can only be switched between speaker/HDMI via a manual profile change.
+    # This configures a profile set for pulseaudio which offers multiple sinks corresponding to the
+    # speaker + 4 HDMI ports. This allows the user to play audio streams on the speaker and any of the 4 HDMI/USB-C
+    # ports at the same time.
+    udev.extraRules = let
+      t490ProfileSet = ./t490-profile-set.conf;
+    in ''
+    SUBSYSTEM!="sound", GOTO="pulseaudio_end"
+    ACTION!="change", GOTO="pulseaudio_end"
+    KERNEL!="card*", GOTO="pulseaudio_end"
+
+    # Lenovo T490
+    ATTRS{vendor}=="0x8086" ATTRS{device}=="0x9dc8" ATTRS{subsystem_vendor}=="0x17aa", ATTRS{subsystem_device}=="0x2279", ENV{PULSE_PROFILE_SET}="${t490ProfileSet}"
+
+    LABEL="pulseaudio_end"
+    '';
+    
+    throttled.enable = lib.mkDefault true;
+  };
+}