From 063cc0e2907254ffce2e76062f4ae62bc3bc3f64 Mon Sep 17 00:00:00 2001
From: Daniel Langbein <daniel@systemli.org>
Date: Mon, 12 Feb 2024 17:19:44 +0100
Subject: [PATCH] fractional scaling

---
 modules/gnome-fractional-scaling.nix | 25 ++++++++++++++++---------
 1 file changed, 16 insertions(+), 9 deletions(-)

diff --git a/modules/gnome-fractional-scaling.nix b/modules/gnome-fractional-scaling.nix
index 6d2e931..105fc4c 100644
--- a/modules/gnome-fractional-scaling.nix
+++ b/modules/gnome-fractional-scaling.nix
@@ -8,6 +8,15 @@ in
 
   # https://wiki.archlinux.org/title/HiDPI#Xorg
 
+  # https://devicetests.com/set-different-scaling-multi-monitors-gnome
+  #   "scale-monitor-framebuffer": This allows GNOME to scale each monitor’s framebuffer independently, which is necessary for per-monitor scaling.
+  #   "x11-randr-fractional-scaling": This allows fractional scaling, which gives you finer control over the scaling factor.
+
+  # TODO open issue: Fractional scaling can't be enabled with multiple monitors.
+  #   https://gitlab.gnome.org/GNOME/gnome-control-center/-/issues/2076
+  #   https://gitlab.gnome.org/GNOME/gnome-control-center/-/issues/2365
+  #   -> https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/2008355
+
   programs.dconf.enable = true;
 
   # Overlays.
@@ -60,15 +69,13 @@ in
   home-manager.users.yoda = { osConfig, config, pkgs, ... }: {
     dconf.settings = {
       "org/gnome/mutter" = {
-        experimental-features = [
-          (
-            if (osConfig.services.xserver.displayManager.gdm.wayland)
-            # Wayland fractional scaling
-            then "scale-monitor-framebuffer"
-            # X11 fractional scaling
-            else "x11-randr-fractional-scaling"
-          )
-        ];
+        experimental-features = (
+          if (osConfig.services.xserver.displayManager.gdm.wayland)
+          # Wayland
+          then ["scale-monitor-framebuffer"]
+          # X11
+          else ["scale-monitor-framebuffer" "x11-randr-fractional-scaling"]
+        );
       };
     };
   };