feat(tazjin/modules): Add HiDPI module r/4049

Change-Id: Ib690ec25ebe10af4924735553a8315609b7cbc4e
Reviewed-on: https://cl.tvl.fyi/c/depot/+/5566
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>

1 files changed, 17 insertions, 0 deletions

diff --git a/users/tazjin/nixos/modules/hidpi.nix b/users/tazjin/nixos/modules/hidpi.nix
new file mode 100644
index 000000000000..942798112a43
--- /dev/null
+++ b/users/tazjin/nixos/modules/hidpi.nix
@@ -0,0 +1,17 @@
+# 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 = 192;
+}