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diff --git a/users/tazjin/nixos/modules/hidpi.nix b/users/tazjin/nixos/modules/hidpi.nix
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+# Configuration for machines with HiDPI displays, which are a total
+# mess, of course.
+{ ... }:
+
+{
+  # Expose a variable to all programs that might be interested in the
+  # screen settings to do conditional initialisation (mostly for Emacs).
+  environment.variables.HIDPI_SCREEN = "true";
+
+  # Ensure a larger font size in early boot stage.
+  hardware.video.hidpi.enable = true;
+
+  # Bump DPI across the board.
+  # TODO(tazjin): This should actually be set per monitor, but I
+  # haven't yet figured out the right interface for doing that.
+  services.xserver.dpi = 161;
+}