diff --git a/lenovo/legion/15ach6/default.nix b/lenovo/legion/15ach6/default.nix
index 3a03d6f..fac30f0 100644
--- a/lenovo/legion/15ach6/default.nix
+++ b/lenovo/legion/15ach6/default.nix
@@ -6,6 +6,7 @@ in {
     ../../../common/cpu/amd
     ../../../common/gpu/amd
     ../../../common/gpu/nvidia/prime.nix
+    ../../../common/hidpi.nix
     ../../../common/pc/laptop
     ../../../common/pc/laptop/ssd
   ];
@@ -17,6 +18,9 @@ in {
 
   services.thermald.enable = lib.mkDefault true;
 
+  # √(3840² + 2160²) px / 15.60 in ≃ 282 dpi
+  services.xserver.dpi = 282;
+
   # https://wiki.archlinux.org/title/backlight#Backlight_is_always_at_full_brightness_after_a_reboot_with_amdgpu_driver
   systemd.services.fix-brightness = {
     before = [
diff --git a/lenovo/thinkpad/z/default.nix b/lenovo/thinkpad/z/default.nix
index b3c8be1..d37af1f 100644
--- a/lenovo/thinkpad/z/default.nix
+++ b/lenovo/thinkpad/z/default.nix
@@ -7,13 +7,13 @@
     ../../../common/pc/laptop
     ../../../common/pc/laptop/acpi_call.nix
     ../../../common/pc/laptop/ssd
+    ../../../common/hidpi.nix # can be dropped after nixos 23.05
   ];
   # kernel versions prior to 5.18 won't boot
   boot.kernelPackages = lib.mkIf (lib.versionOlder pkgs.linux.version "5.18") (lib.mkDefault pkgs.linuxPackages_latest);
 
   hardware.enableRedistributableFirmware = lib.mkDefault true;
   hardware.trackpoint.device = lib.mkDefault "TPPS/2 Elan TrackPoint";
-  hardware.video.hidpi.enable = lib.mkDefault true;
 
   services.fprintd.enable = lib.mkDefault true;